Would need a bit more info on the tournament to give more relative advice... avg stack? runners left? payouts? how long left on the level?
But for me in general, in that spot depending on other factors most of the time I''m flatting, your getting 4 to 1 on your money for a call. And with two limpers plus the aggressor acting from early/middle position you have to think a stronger ace is in their range. I would just call to see a flop. I would not recommend shoving here in most cases into 3 villians, even if one calls and turns over KQ, KJ, TJs etc you still don't have great equity. But as I said it has a lot to do with other factors as well. Even folding Pre-flop wouldnt be the worst lay down, as when you call your only really hoping for a 9 high board or clubs at best.
How did you go in this MTT by the way?