KQo vs PF 3-bet

[SixT4]

I figured I was WA/WB but wanted to protect my hand on the flop. After I'm 3-bet is it worth calling down?

Villain only had 7BB at the start of the hand and has only played 3 hands so I assume he bought in short and may be a bit of a donkey.

Against a solid player, what would your line be?

Party Poker 0.50/1 Hold'em (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is MP1 with K[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, CO calls, <font color="#CC3333">Button 3-bets</font>, <font color="#666666">2 folds</font>, Hero calls, CO calls.

Flop: (10.50 SB) 7[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, CO checks, <font color="#CC3333">Button bets</font>, <font color="#CC3333">Hero raises</font>, CO folds, <font color="#CC3333">Button 3-bets</font>, Hero calls.

Turn: (8.25 BB) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

River: (10.25 BB) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets</font>, Hero calls.

Final Pot: 12.25 BB

[Harkon]

This is good, especially since the dude bought in short (ie. he's probably an idiot). Against a solid player you can check/fold the river unimproved, he has TPTK or better.

Edited to add: if it was HU it would generally be better to just check/call down, possibly bet/folding the river against a solid guy, and either check/calling or bet/calling against a shortstacker. Check-raising the flop in this hand only makes sense because there is another guy in between.