Supporter runs away from march (4)

I believe the answer is:

ally

I'm a little stuck... Click here to teach me more about this clue!

'supporter' is the definition.
(an ally is a friend or supporter)

I can't explain the rest of the clue.

(Other definitions for ally that I've seen before include "Comrade in arms" , "often helpful when cluing adverbs" , "Associate that provides assistance" , "Cooperating country" , "Accomplice" .)

I've seen this clue in The Times.

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.