Not far from one arsenal (4)

I believe the answer is:

near

'not far' is the definition.
('near' is the opposite to 'far')

'from one arsenal' is the wordplay.
'from' indicates a hidden word.
'NEAR' is hidden in the letters of 'one arsenal'.

(Other definitions for near that I've seen before include "Close in time or place" , "Adjacent" , "Close at hand" , "Miserly; approach" , "Close - tight" .)

I've seen this clue in The Daily Express.

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