Crossword Genius

Physical attack that may require charge (7)

Ross

I believe the answer is:

battery

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But I can't explain it at all! Could you help me understand?

(Other definitions for battery that I've seen before include "violent offence" , "Source of stored energy" , "Source of charge" , "One's charged" , "Gun emplacement - egg farm" .)

I've seen this clue in The Telegraph.
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