Fly

The clue “Fly is AVIATE” in a crossword puzzle implies that the answer is a verb which means “to fly” or “to operate an aircraft.” The word AVIATE is a relatively uncommon term that is mainly used within the aviation industry. It is typically used to describe the act of flying an airplane or helicopter. Therefore, the answer to this crossword question is most likely to be “aviate” which is a synonym of “fly” or the act of piloting an aircraft.