Let me show you the wonder of 1st and 2nd ed AD&D.
You get with your DM, and if they agree, or if you ARE the DM... Clerics can now use slings.
I had a DM that would let you wield whatever you wanted, but you'd suffer some heavy experience penalties. Our group rolls for Magic Item privileges. d20, highest roller to lowest, and you'd get to pick from the assorted treasure we recovered. Well, one the players was a bit of a jerk, and his mage selects this fairly enchanted bastard sword, and leaves a wand, knowing full well that no one else could use it. Like I said, jerk. He spends the next couple of sessions swinging this sword and having some success. Well, comes the end of that adventure, and the DM hands out cards with experience rewards. The rest of go up a level, maybe close to two. Guess what he got? He got a note telling him that his efforts have paid off, and he's just started a new career as a warrior. 1 experience point, 1st level fighter with a magic user's ability scores. LESSON LEARNED.