Snowballs, in a snowball fight (4)

I believe the answer is:

ammo

'snowballs in a snowball fight' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ammo that I've seen before include "Bullet" , "Bullets, shells (colloq.)" , "Bullets, shells, etc. (abbr.)" , "Bullets, etc. (colloq.)" , "Contents of magazine" .)

I've seen this clue in the Universal, The New York Times and the Newsday.

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