Green on the blue?

SEASICK is a 7-letter word and the answer to the crossword clue "Green on the blue?" The question mark is a signal from the puzzle constructor that this clue involves a pun, double meaning, or lateral wordplay. Rather than defining SEASICK directly, the clue approaches the answer from an unexpected angle. When you see a question mark at the end of a clue, resist the obvious reading and look for the twist.

See all clues for the answer SEASICK.