Bad play early

[rivered]

It is a $20 at Party and blinds are still only 25/50.

I get A [img]/images/graemlins/club.gif[/img]Q [img]/images/graemlins/heart.gif[/img] in the small blind.

Cutoff limps and I complete.

FLOP:

A [img]/images/graemlins/heart.gif[/img]3 [img]/images/graemlins/heart.gif[/img]4 [img]/images/graemlins/heart.gif[/img]


For some reason I decide to check (thinking trap I guess). I was HU in a SNG at the time so I wasn't really paying a lot of attention if that's an excuse. Anyways, cutoff bets 60, I raise back 60 and he goes allin for about 1500. I have about 1800 chips left. I haven't seen him do anything bad or try any bluffs earlier but I have won a couple pots when I hit big hands and raised a lot but didn't see a showdown.

So the question is how obvious a fold is this? Is there any way I can call this or is it a clear fold?