Crossword Genius

Water balloons at summer camp, maybe (4)

Ross

I believe the answer is:

ammo

(Other definitions for ammo that I've seen before include "Bullets, shells, etc. (abbr.)" , "What's fired from a gun (abbr)" , "Bullets (sl.)" , "Bullets, shells, rockets etc" , "Bullets, etc. (colloq.)" .)

I've seen this clue in The New York Times.
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