[JasonP530]

I wouldn't 5bet the turn, because if you lead/3bet the turn it is VERY likely he can beat 1 pair when he 4bets you. When you lead, he will often raise one pair to protect it, since it looks like you didn't want to give a free card either, and he is trying to get the SB out of the pot. Some people overplay AA there(wouldn't you 3bet the flop or c/r the turn with two pair or better they can reason), or they could have a pair/clubdraw or straightdraw/clubdraw, which is why you need to calldown after being 4bet. I like the turn donk, in the hopes that SB will fold some weaker draws given the size of the pot, and because PFR will raise one pair hands again, allowing you to 3bet...

-jason