Had a feeling that 7A was CROWN, and knowing NNN made me figure everything out. But I did turn the overthinking dial up to 11 during the solve because I thought you were asking for CHARLIE CHAPLIN's hat. I guess a CROWN doesn't really make me think "hat", but alliteration > clue accuracy, am I right?
I also need to know what OOO has to do with rock-paper-scissors, unless "Rochambeau" can also refer to tic-tac-toe (and even then, why would it be an "unlikely" line?)
Rochambeau is what my brain thinks "tic-tac-toe" is called right as I'm about to have a nap. I'd say it's unlikely because the first player has a significant advantage, if you're playing it right.