I dont like the check raise on the flop. 99 is a fragile hand and it should be protected on a flop of 3 under cards with 2 clubs. you should be betting the pot as fast as you can here, and you may have gotten the opponent to play it differently. At these low limit games, if you bet the pot, and you get a call almost instantly, i put the person on a draw. Usually when someone is going to flat call you with a monster, they at least think about raising first and act slower than a draw does. On the turn, you could check/fold or put out a tester bet and fold to a raise. But i think that the best way to avoid this would be to act first and try to take the pot early.