Crossword Genius

Short of ammunition? (4)

Ross

I believe the answer is:

ammo

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

This clue might be a double definition.

'short' is the first 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 don't see?

'ammunition' is the second definition.
(synonyms)

'of' is the link.

Can you help me to learn more?

(Other definitions for ammo that I've seen before include "explosives, perhaps" , "What's fired from a gun (abbr)" , "Bullets (sl.)" , "Bullets, say, in short" , "eg Bullets, shells" .)

I've seen this clue in The Mirror and The Globe and Mail.
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