Gunners picking themselves up on the ways back (7)

I believe the answer is:

arsenal

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

'gunners' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for arsenal that I've seen before include "Military structure for arms and ammunitions" , "Weapons/ammo store" , "Munitions store and English football team" , "gunners, so-called" , "Football club based at Emirates Stadium" .)

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.