Crossword Genius

Oppo research hoard (4)

Ross

I believe the answer is:

ammo

(Other definitions for ammo that I've seen before include "Bullets etc.(informal)" , "eg Bullets, shells" , "What's fired from guns (abbr)" , "rounds briefly" , "Bullets, shells (colloq.)" .)

I've seen this clue in the Newsday.
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