Top pair and nut flush draw

[Toonces]

$3/$5 B&M No-Limit game

BB is a middle-aged woman that's new to B&M poker and bets way too little, but is only semi-loose passive ($500 stack). UTG is an asian woman who loves to bet and chase($500 stack). MP1 is fairly experienced, loves to go heads up with UTG and raises questionable hands at times ($1400 stack). CO is a maniac who flashed me the T[img]/images/graemlins/heart.gif[/img] ($800 stack)

Hero has A [img]/images/graemlins/club.gif[/img] T [img]/images/graemlins/club.gif[/img] on the button ($900 stack).

UTG calls. MP1 raises to $20. MP3 calls. CU calls. Hero calls. BB calls. UTG calls.

Pot is $123. Flop is A[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img]

BB and UTG check. MP1 bets $100. MP3 and CO fold. Hero raises to $300. BB and UTG fold. MP1 goes all in. Hero calls.

Most questionable part of hand for me is the raise on the button. I would do it all day at limit poker. Is it a bad move here?

Anything else you do differently?