I have nut straight on turn. 3 flush cards showing, do I raise?

[spydog]

MP2 here is loose passive (42/0)
UTG is laggy (42/12)

Flop: Call or fold this? Anyone raise this?

Turn: Is this a clear raise on the turn? I can't see MP2 betting a flush draw on the flop, so I'm probably best. Plus, I need to push out UTG if he has a lone club. Plus, it's easy to fold to a 3-bet, no?

Party Poker 3/6 Hold'em (8 handed)

Preflop: Hero is Button with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="666666">2 folds</font>, MP2 calls, <font color="666666">1 fold</font>, <font color="CC3333">Hero raises</font>, <font color="666666">2 folds</font>, UTG calls, MP2 calls.

Flop: (7.33 SB) T[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, Hero calls, UTG calls.

Turn: (5.16 BB) J[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, Hero .....