AFTER 17 years in the Major Leagues, Lance Parrish finds himself in the same situation as many of the game's younger players. ''I'm looking for a job,'' he said at Detroit's training camp. ''I don't feel I'm just here as a guest.'' With that, Parrish grinned, crossed his massive arms and then leaned back against his locker with a look of satisfaction. Parrish, Travis Fryman and Eric Davis hit homers and five Detroit pitchers held Philadelphia to three hits in a 4-0 victory. ''I had no idea what kind of opportunity I was going to get,'' said Parrish, in camp as an invitee. ''I just made up my mind to make the most of whatever they gave me. I think I'm doing the job right now.'' Parrish was an All-Star catcher on the Tigers' 1984 championship team. But he has played for four teams since then, being released by California, Seattle and Cleveland. ''He keeps plodding along, doesn't he,'' manager Sparky Anderson said. ''I still don't see none of the [flawed] things I was supposed to be looking for. ''Maybe in a couple of weeks I'll tell you a different story. But, right now, Lance looks good.'' In recent seasons, other managers haven't always agreed. He finished 1992 in Seattle, where he hit eight homers in 69 games. Last year, after going to spring training with Los Angeles, he started the season with the Dodgers' farm club at Albuquerque. Cleveland purchased his contract, but the Indians released him after only 10 games.