If the river card wasn't the 9 of clubs, I think a check raise here would be in order.

The pot odds here justifies a call on the turn, but let's say the 4 of clubs and 9 of clubs is dirty 25% of the time here:

1 of 4 you will lose 2 bets on the river since you will get raised (you will bet and call the raise)
3 of 4 times you will win 1 bet on the river since UTG+1 calls and Button fold. Let's say button calls one time here so make that an average of 1,33BB

So assuming my thoughts are correct here you will win 2bb here for each 4 situations that is like this (or 0,5bb/hand). I call and bet the river like you did, unless it's a blank nine that rivered and my opponent is aggressive in which case I c/r and get one more bet from him.