FRED FISKE moves from retirement to semi-retirement this Saturday with the debut of "Fred Fiske Saturday," an hour-long hard-news program that will focus on the week's top stories. Airing at 11 a.m. on WAMU-FM (88.5), the show follows National Public radio's splendid "Weekend Edition With Scott Simon," which begins at 8.

While the Simon show is also a news-of-the-week style radio magazine, WAMU program director Steve Palmer isn't worried about a lot of story duplication.

"We'll try to keep an eye on that {duplication} and try to avoid it, but this will have the added element of listener call-in," says Palmer. "This will bring a different perspective with a special guest, or two, or three, and rarely will there be prerecorded interviews."

Fiske, 66, whose short-lived retirement began in May, will focus this week on Robert Bork's nomination to the Supreme Court; and guests will be Ralph Nader and Heritage Foundation vice president Gordon Jones.

At 3 p.m. Saturday, WDCU-FM (90.1) announcer Felix Grant will feature the best of dance bands or contemporary big bands including those of Pat Williams, Leslie Drayton, Bob Florence, Ashley Alexander, Dave Stahl and Canada Rob McConnel's "Boss Brass."

Speaking of debuts, the '87 Redskins season kicks off Sunday against the Philadelphia Eagles and can be heard on WMAL-AM (630). Trumbull and Core get things rolling at 10:30 a.m. with a tailgate party from RFK Stadium, Parking Lot 8; followed by Johnny Holliday's "Stadium Show" at 11:45 a.m.; and kick-off at 1. After the game, hear the "Locker Room Report" followed by Ken Beatrice's "Sports Call."