Crossword Genius

Impromptu jazz concert (3,7)

Ross

I believe the answer is:

jam session

(Other definitions for jam session that I've seen before include "Impromptu 22 concert" , "jazz performance" , "time for a sarnie?" , "playing of improvised bebop?" , "Gathering of jazz musicians" .)

I've seen this clue in The Telegraph.
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.