Turf specialist Prince Heir, a former claiming horse by the stallion Berkley Prince, moved between horses on the final turn and went on to win yesterday's $30,000-added Constellation Handicap by more than a length at Laurel Race Course.

Clarinet King finished second, followed by Double Whammy, who surrendered a clear lead at the head of the stretch to be third.

The win was the fifth straight for the 5-year-old who raced for as little as $16,000 in the claiming ranks this year. It brought his seasonal earnings to more than $100,000.

Trainer James J. Pascuma Jr., who felt that the previous owners of the chestnut were not using his ample speed properly, instructed jockey Jimmy Miranda to lay off the early pace and make one run. At the three-eighths pole, Miranda did as he was told and the race was over by midstretch.

Princely Heir ran the 1 1/8 miles in 1:48 3/5. The winning mutual was $5.60 and topped a 7-5 exacta worth $24.80.

Carried Ruben Hernandez over six furlongs in 1:10 3/8, Engine One took the place by a half-length over the favored Guilty Conscience.