Crossword Genius

Water balloons on a hot day, say (4)

Ross

I believe the answer is:

ammo

(Other definitions for ammo that I've seen before include "that goes in magazine: ...?" , "explosives, perhaps" , "Bullets (sl.)" , "Bullets, etc. (colloq.)" , "Bullets etc.(informal)" .)

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