[rzk]

i would actually bet the turn for fear of it being checked through.
as played, it's between a call and a raise depending on the bb. if bb is a complete unknown i'm leaning towards a raise. even if you are somewhat behind bb's range, the other players are padding the pot. of course if all of them call and a club falls on the river, you will just check and fold.

edit: come to think of it, i guess an unknown who bets into 3 people would usually have you beat with an overpair or better, though he might easily have TT with a club or AQ with the ace of clubs etc. but i think on average you are too far behind his range to raise this. so i call. but i still like donking the turn to begin with.