your position preflop I think is quite important, were you CO and bet with the AQ? In general I wouldn't go much more than 4xBB so your raise is justified, however the triple raise after that would make me fold in most cases - unless I knew good infos on the raiser.

Knowing you have top two pair on the flop you really have to wonder why the guy calls your very large bet - what could he possibly have ? Would he re-raise with AQ as well preflop? He might call the flop with KK but it's unlikely I'd say having the Ace there... I'd put him on something like QQ or maybe even AA.. although there is a chance he could have something like AK where the King is of clubs, although with no improvement on the turn would he really want to stay in with just top Pair ?

The fourth club is very scary on the river and it's likely his flush is good or in the other case he's not worried about you having a flush (if he had trip Q's for instance)