A few things. First off, I don't like calling a preflop TAG raise to 8BB with A3s, I think this is usually a fold, unless there's some dynamic with the table where you know it's going to go 5 ways to the flop and no one is going to LRR you.
As for your decision on the turn, it's probably a call, but not purely because of the flush draw. You have an overcard which might be good if you hit, and you might actually be ahead, as there are a couple hands he could potentially have here, including K
10
, 10
9
, maybe even 8
7
. There's enough here that I think it's a call