Prepared to fight rather than leg it (5)

I believe the answer is:

armed

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'prepared' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for armed that I've seen before include "with Browning?" , "Bearing weapons" , "Being equipped with 25 Across" , "equipped for fighting" , "Gave weapon" .)

I've seen this clue in the Evening Standard.

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