Battle suit (6)

I believe the answer is:

action

I believe this clue is a double definition.

'battle' is the first definition.
(military action)

'suit' is the second definition.
(synonyms)

(Other definitions for action that I've seen before include "Thing done; armed conflict" , "Order to start shooting" , "skirmish" , "Court case" , "Battle (in the law courts?)" .)

I've seen this clue in The Guardian and The Globe and Mail.

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