Crossword Genius

Peas for shooter? (4)

Ross

I believe the answer is:

ammo

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

This clue could be a double definition.

'peas for' is the first definition.
The definition suggests a singular noun which matches the answer.

'shooter?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

Can you help me to learn more?

(Other definitions for ammo that I've seen before include "Bullets (sl.)" , "Projectiles" , "essential supplies for soldiers" , "arms" , "eg Bullets, shells" .)

I've seen this clue in The Sun.
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