Before yesterday's $45,350 Marshua Stakes at Laurel, trainer Marvin Moncrief said he was concerned that his speedy filly Clever Power might have trouble going the final 16th of a mile in the 6 1/2-furlong race. But Clever Power's problems began well before that.

The 3-to-5 favorite, Clever Power didn't start with her usual verve, and when Diggyliggylo passed her into the turn, she was finished. Jimmy Edwards sent Willa On The Move whistling past Diggyliggylo. Willa On The Move, a Leon Blusiewicz-trained filly, went on to a three-length victory over Fat And Foxy in 1:18 2/5.

Fat And Foxy rallied into second after breaking slowly on a fast track that featured large patches of slop. The filly, claimed by trainer Joe Devereux last month for $18,500, attempted to jump puddles down the backstretch, then did her best running for jockey Greg Hutton where the track was dry.

Although the racing surface was particularly messy in the seven-furlong and one-mile chutes, track vice president Bob Manfuso said it was unlikely today's races at those distances would be changed.

In winning her second of three career races, Willa On The Move earned $29,488 for owner Lorraine Quinichett of Silver Spring. "This filly is better than {1981 Demoiselle and Selima Stakes winner} Snow Plow," Blusiewicz said. "There's no telling how good she'll be."

In the race preceding the Marshua, Kentucky Derby hopeful Private Terms extended his unbeaten streak to three with a half-length victory over Royal Legend.

Three-wide under Vince Bracciale Jr. much of the race, Private Terms caught Royal Legend in midstretch and finished seven furlongs in 1:24 4/5. Charlie Hadry, who trains Private Terms for Locust Hill Farm, said the colt might run next in Laurel's $100,000-added General George Stakes, a one-mile race for 3-year-olds on Feb. 15.

Kent Desormeaux is scheduled to resume riding today following a one-week suspension for a riding infraction. Desormeaux, however, missed only four days of racing; Laurel was snowed out Tuesday, dark Monday and Wednesday.

With the nation's 1987 riding leader absent, Ron Franklin and Donald Miller Jr. lead Laurel's jockeys with five winners each. Bracciale and apprentice Darren Muino each won four races, Edwards, John Baboolal and Paul Nicol Jr. three . . .

Phil Johnson is one of the most respected trainers in New York, but his $75,000 claim for the 3-year-old filly Yellowtail has some Marylanders bewildered.

Yellowtail won one of her first seven starts in Maryland for trainer Dick Small, who then shipped her to Aqueduct, where Johnson claimed her. After finishing next-to-last in her next two allowance starts, Yellowtail finished fifth in a field of nine $75,000 claimers Friday.

Gulfstream Park:

In Hallandale, Fla., Jade Hunter took the lead going into the first turn and held off 6-to-5 favorite Cryptoclearance in the stretch to win the $200,000 Donn Handicap by a length.

Jade Hunter, ridden by Jerry Bailey, ran the 1 1/8 miles in 1:48 4/5.