10/20 LO8 Explain

[cwar]

Villain is very capable, rarely 3bets preflop, mixes up his play, reads hands well, plays preflop well and isnt definitely not hyper aggro and can make folds. We have been playing HU for a long time at this point and Im up about 8bb. He missed one or two bets that I could see but thats about it. What should I be thinking here on this flop and what should my plan be for the rest of the hand?

Hero raises A[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img]
Villain 3-bets, Hero calls

Flop comes A[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] (6sb)
Villain bets