4-way, call playing the board?

[pokerhooker]

Live 20-40 game.

I raise in MP with A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/club.gif[/img]. Aggressive prop to my right 3-bets (AJs+, 88+). LAGish calls in the SB (wide range), and loose, passive BB calls (any 2 will do).

I cap, and we take the flop 4-handed with 16 SB's.

Flop is 7 [img]/images/graemlins/club.gif[/img]6 [img]/images/graemlins/spade.gif[/img]5 [img]/images/graemlins/spade.gif[/img] .

Check, check, I bet, everyone calls. 10 bb's

Turn is a 9 [img]/images/graemlins/club.gif[/img]
Check, check, I check, prop checks.

River 8 [img]/images/graemlins/club.gif[/img] , and the SB insta-bets. My first instinct was it was a whiffed turn-check raise, or a bluff since no one bet the turn. The board now shows a straight, but the dilemma of course is a T makes a higher straight and runner runner clubs got there.

BB calls which really doesnt mean anything. I think about whether she's clever enough to just call with a T or clubs and don't come to anything decisive.

It's on me with a player yet to act... action?