Crossword Genius

Begin filming battle (6)

Ross

I believe the answer is:

action

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'battle' is the definition.
(military action)

I can't explain the remainder of the clue.

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(Other definitions for action that I've seen before include "The process of doing something" , "Jarndyce and Jarndyce, say" , "Combat" , "Performance" , "Battle (in the law courts?)" .)

I've seen this clue in The Sunday Times.
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