Supreeta's March reference is correct i guess. March says that under Clemmensen conditions, alpha,beta unsaturated ketones are either completely reduced or, if partially, only the C=C bond is reduced. But this is a disputed info so it won't come most likely. If it cones, better follow March. Be informed that March is a very respected book.
I was talking about the ring question. For mechanism, sn sanyal is best.