I will go out on a limb and lead the club ace. It is very possible the club will go away on the diamonds. I hope we have a club and a spade trick. Dummy probably has the king of clubs or a stiff club, or just a ton of HCP to not be worried about clubs. If he has a stiff C then the ace of clubs will be a very good lead, if it's the king it will be good or break even, and with xx then they're gonna have a pitch anyways, possibly 2.