One of the reasons that you want to play aggressively is to find out if your opponenent is indeed on the flush draw. So if you know he has a flush draw, you don't have 6 outs, you have way more. You can bet the pot on the turn and try to take it down or make a small turn bet and then depending on the river, if non flush card hits you can bet the same amount again.

I'm not saying this is the right way, but if I do have a read such as this, this is how I would play it.

ViolentGandhi