Grp. mobilised in WWII (3)

I believe the answer is:

raf

(Other definitions for raf that I've seen before include "It fought Battle of Britain" , "Royal Air Force (abbr.)" , "Airforce of Great Britain" .)

I've seen this clue in The Washington Post.

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.