Extra-marital affair (5)

I believe the answer is:

amour

(Other definitions for amour that I've seen before include "(Illicit) sexual relationship" , "close relationship" , "French romance" , "Affair of the heart" , "French lover" .)

I've seen this clue in The Guardian.

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.