Start filming battle (6)

I believe the answer is:

action

I believe this clue is a double definition.

'start filming' is the first definition.

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

(Other definitions for action that I've seen before include "war?" , "Not CIA (anag)" , "Film director's cry?" , "''. . . . . . speaks louder than words'' (6)" , "SECOND PART OF 15" .)

I've seen this clue in The Guardian.

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