He has J-9, 10-9, 5-6, 6-9, or 7-9, right? And while it's possible he has 2 clubs, it isn't particularly likely.

So if he has J-9 or 6-9, he's made his straight. If he has 5-6, 7-9 or 10-9, he's on a draw, 8 cards out of 45, turn or river. We have priced that draw at 2-1, so if he reads you as giving him a check on the turn, he may call here. If he reads you as likely to bet the turn, he's going to fold.

When I face this situation in no-limit, I tend to make the price a bit higher. But I am not convinced of this-- that's why I phrased it as an open-ended question.