Crossword Genius

Possibly arming at border (6)

Ross

I believe the answer is:

margin

'border' is the definition.
('margin' can be a synonym of 'border')

'possibly arming' is the wordplay.
'possibly' indicates an anagram.
'arming' with letters rearranged gives 'MARGIN'.

'at' acts as a link.

(Other definitions for margin that I've seen before include "Edge; room for error" , "Edge or space for error" , "Blank space around the edge" , "Border or leeway" , "Bound" .)

I've seen this clue in The Mirror.
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