I think I check behind on this river. With no raise pre-flop its unlikely he has an overpair and his re-raise/call on the flop means at a minimum he has A8.
His 7 dollar bet and 17 dollar call on the turn makes me think he could have A8clubs. I see more hands beating us making a river call then not. If he re-raises all in on the river it would be hard to get away from and I dont see what he could have that we would beat. JMO