A Royal since the Mets traded him for Joe Foy Dec. 3, 1969, Amos Otis suddenly is an ex-Royal, told to put his uniform away, for keeps--right now. Just three runs batted in away from 1,000 RBI for his career, Otis was told he will not be used any more this season, or ever. "We feel we have some talent in our farm system, and there's no sense in marking time any longer," said Kansas City G.M. John Schuerholz. "Even though it affects a veteran player like Amos, we have to get on with it . . . It seems hard to have it come to an end in a conversation in a motel room on a road trip. But he's a professional . . . and he took it in that manner."

Otis, 36, .281 lifetime average, saying all right, "I've never been one to be a nuisance," hopes to catch on elsewhere. And Schuerholz says all right, since he isn't retiring, there will be no Amos Otis appreciation day. Meanwhile, K.C., which would have been obliged to pay him about $500,000 to play another year, exercised a buy-out option at a reported $150,000 . . .

The Indians' days in Cleveland could be numbered. Late owner F.J. (Steve) O'Neill's nephew and estate trustee, Patrick O'Neill, puts it so: "We will make a sincere effort to keep the club in Cleveland. But there's a lot of problems. Anything could happen to the franchise. The club is for sale to the right buyer." Not so long ago, such talk would have swizzled speculation about, at last, a team for RFK.