NL50 - Flop nut flush draw in a big pot

[Triggerle]

Table was quite semi-loose aggressive with more than occasional 3-betting going on. (Not really best table selection by me). Villians stats are 21/20/1.33 and we have to assume that he is at least a decent player.

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $48.75
UTG+1: $64.90
Hero: $56.30
Button: $37.90
SB: $58.50
BB: $91.75

Pre-flop: (6 players) Hero is CO with A[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/diamond.gif[/img]
<font color="#cc0000">UTG raises to $1.75</font>, UTG+1 folds, <font color="#cc0000">Hero raises to $5.5</font>, 3 folds, UTG calls.

Flop: 7[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/diamond.gif[/img] ($11.75, 2 players)
UTG checks, <font color="#cc0000">Hero bets $9</font>, <font color="#cc0000">UTG raises to $23</font>, Hero ??