The way you've played it, I'd just sac up and call. The board is pretty drawish, and you've induced a bluff against a flush draw and 87. If the board weren't so drawish, or if the flop A wasn't a club, I think you'd have an easier fold.

I also think your turn bet is a little weak, because it sets you up for this situation with flush draws. If he puts you on an A, he has a pretty good expectation of stacking you if a club hits (or a 5 or T if he's holding the less likely 78), as most players will have trouble folding trips. As it is, you've offered him better than 3:1 by betting less than 1/2 the pot, plus he's eying the remaining $11 in your stack. If you are uncomfortable calling a potential bluff on the river but feel like you have to follow through on the turn, bet $7 or $8 on the turn, and a smart FD will have to fold. Normally, if you are solidly ahead, it's OK to make a smaller bet to encourage Villain to draw, but you don't know if you are ahead, so a turn fold by Villain is a decent result for you.