Former Redskins running back Clarence Harmon successfully petitioned a Texas judge to be released from probation on a drug charge, but Fairfax County School Superintendent Robert R. Spillane said he still does not intend to rehire him as a school aide.

Harmon worked briefly as a $9,000-a-year aide and volunteer football coach at Langley High School this fall. He resigned Sept. 19 after county school officials discovered that he had pleaded guilty to possession of a controlled substance, cocaine, in a Texarkana, Tex., court in 1983. The case was well publicized at the time, and School Board Chairman Mary E. Collier said Fairfax personnel officials probably should have known about it when they hired Harmon.

In the Texas case, Harmon was fined $5,000 and placed on probation for two to 10 years. Under Texas law, he was considered to have no criminal record.

At a hearing Nov. 25, Texas District Court Judge Guy Jones accepted Harmon's application to be released from probation. Charges against him have been dismissed, according to prosecutor Louis Raffaelli, who did not oppose Harmon's petition.

Spillane, who rejected Harmon's attempt to retract his resignation several days after Harmon submitted it, said last week he would not rehire him now even though the Texas charges have been dismissed. Spillane said other factors, which he would not explain, also played a part in his decision.

Reed Saunders, president of the Langley High School booster club, said he and other parents continue to hope to get Harmon back. "He has extremely strong support at Langley," Saunders said.

One sign of that support, he said, came when Harmon attended the school sports award banquet Nov. 26. When Harmon was introduced, Saunders said, "He got a standing ovation from 800 kids and parents."