It keeps you cool (6)

I believe the answer is:

mister

(Other definitions for mister that I've seen before include "that's what you'd call him" , "Bloke" , "Male form of address" , "Mr" , "Merits of form of address to man" .)

I've seen this clue in The Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.