Crossword Genius

Contents of some belts, informally (4)

Ross

I believe the answer is:

ammo

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

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