Given your option to flat pre, you should continue with your passive line and check call the flop, then lead a brick turn. The problem with c/r the flop is if he does have the ace of clubs, he continues and if he doesn't have the club draw he's most likely folding. You can lead a brick turn by giving him incorrect odds to call hoping to hit the flush if he does have it. With the c/r on the flop he gets the implied odds to shove here and you still have fold equity in his mind so it makes it profitable for him to shove the flop with two overs and the draw to the nuts. I think wanting to get it in here eliminates your edge