Turn semi bluff vs LAG

[KitCloudkicker]

Live 10/20.

Game has one LAG who is the villain in this hand. Plays extremely aggressive preflop. Postflop is also aggressive, but not crazy. Has laid down a few times to postflop aggression, but I dont know what he's laid down as he's mucked his cards.

Folds to me and I raise QcJc in the hijack. The button cold calls (loose passive) and the BB (LAG) calls.

The flop is Ah9c3d. BB checks, I bet, button calls, LAG calls. At this point I think I'm done with the hand.

However, the turn is a 10c. The LAG now comes out of nowhere and leads.

Should I consider semi-bluffing? How often does this play have to work to be profitable?