ctuncok

I'd assume partner would have 2 other places to run to when he overcalls AJxx at 2 level. I would play partner to have 9 AJxx Hxxx Jxxx. In which case, playing a trump or a free diamond ruff just gives the contract away. If I return a trump, the 7 spot wins, a D ruff with the T follows, and declarer can ruff the 3rd club high to draw trump. And If I play a diamond he simply ruffs and draws trumps and claims with 5332. As for which club is the right play, if partner has the J of clubs, I don't need to play the Q, if declarer has it, not knowing the trump split he has no reason to duck to Jx of clubs. So I think a small club is the right play. Declarer will likely play a trump to A and ruff a diamond with T, and will have to lose another trick to the uppercut for -1.