[bbartlog]

I double-checked, and the flop was double-suited, so I had six clean outs. Still, this was as good an opportunity as I was going to get. I see your point thanks.

Yes, if you look at clean outs you're not in really great shape. But look at it this way - while the nut flush draw will presumably call you here, the fact that you have top pair already means that you are ahead of the majority of the nut flush draw hands. Basically your top pair gives you an edge against many drawing hands, while your draw gives you decent equity against some of the made hands that might call you. For example, against a hand like 6789 (a made low straight) with no flush draw you are only a 65/35 dog.