Crossword Genius

A bit of ammunition in the vicinity (6)

Ross

I believe the answer is:

around

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'in the vicinity' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for around that I've seen before include "Close to" , "Here and there; encircling" , "About, here and there in circular way?" , "Present; approximately" , "On every side" .)

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