$11 --- Ks9s top pair on all club flop. Lead out?

[Milton19]

You have to lead out even though the situation isn't great. Even if someone hasn't already got a made flush you can't give them a free card to hit it.

I would bet about 160. If you get called just check the other streets. If no other club comes and another player bets you'll have to decide if the pot odds are worth a call.