Wide receiver Gary Clark sat out yesterday's Redskins practice with a sore hamstring, but the club said it was only a precautionary move and Clark is expected to start Sunday against the San Francisco 49ers.

Several times in his career Clark has had slight hamstring pulls. It is not unusual for him to sit out an occasional practice.

The Redskins should go to San Francisco at full strength.

Defensive end Fred Stokes, whose status early in the week appeared bleak because of a continuing shoulder problem, fully participated in yesterday's practice and should start. "He got blindsided in practice today by Ed Simmons and was knocked on his can," said trainer Bubba Tyer. "But Stokes got right back up. He should be okay."

The Redskins have ordered a new harness for Stokes that should give his shoulder more mobility than he has now, but it has yet to arrive. Tyer said he hopes to have it in time for Sunday's game.

Linebacker Monte Coleman, who missed one practice this week with a hip strain, practiced yesterday and will be available Sunday. The Return of Carter

San Francisco nose tackle Michael Carter, who missed the preseason and was on the inactive list last week because of offseason surgery on his right foot, is likely to play against Washington.

"We really haven't expected to see him," said Washington Coach Joe Gibbs. "We haven't seen him on film" from this season.

Redskins center Jeff Bostic said he was not concerned with who lined up against him. "You can't prepare for one player; you must prepare for the defensive front," he said. . . .

Gibbs said third-down back Kelvin Bryant was not under-used in Sunday's 31-0 win over Phoenix. Bryant caught one pass (for 11 yards) and ran once (four yards).

"He was in on all third-down situations," said Gibbs. "We just couldn't get him the ball." . . .

The Redskins, 29-0 winners over Seattle in their final game last season, are seeking their third consecutive shutout. The 49ers have not been shut out in 195 consecutive regular season games, the longest active streak in the NFL. . . .

The 49ers have won nine straight, including last year's postseason. The Redskins have a six-game winning streak. . . .

San Francisco's Roger Craig could become all-time leading receiver among NFL running backs Sunday. He has 486 catches. Walter Payton, who played 13 seasons with the Bears, holds the record of 492. Need for Perfection

Although many Redskins do not want to put overimportance on Sunday's game, quarterback Mark Rypien feels otherwise. "It is not just another game," he said. "It's one of those things where, if we don't get a win, it will let a lot of air out of our tires.

"We have to play pretty much a perfect game to stay in it," he said. "They are that good and they are not a fluke. . . . They have about five or six guys who will be in the Hall of Fame."