your query on clueless.
on clueless only the judge votes as it were. they can ask someone to explain their clue if they want to. although personally I think that if you don't "get it" you aren't going to pick it are you. you could also be said to be commenting on a clue - saying in effect, what is this crap, I can't understand it. that wouldn't be very nice, would it.
it's different on peer review. everybody is a judge so everybody can ask for an explanation if they need it.
hope that helps.