[adam74]

Based on your read of the player, he's not drawing purely to the flush, so I guess all I'd be worried about is if he had a draw to a higher straight and his hand also contained a couple of low/medium clubs. Might he have raised on the flop with such a hand?

If he was drawing to a higher straight or a full house, then he's missed, and is unlikely to call again. If he has a flush, then he'll probably call any bet you make.

Is he capable of bluffing if you check?

I think I check-call. I don't think it's worth betting since I don't think he'll call with anything that you can beat, unless he's seen you bluff here before, or bet out with, say, two-pair and he has a set. Calling any bet he might make depends on whether you think he's capable of bluffing in this situation.

I guess betting out is only worthwhile if you think he'll lay down a non-nut flush. Personally, I don't think he would.