Crossword Genius

Go out when you light up (6)

Ross

I believe the answer is:

strike

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'go out' is the definition.
(thesaurus)

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

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(Other definitions for strike that I've seen before include "Deliver a blow" , "Sudden attack; chime" , "Walk-out" , "Downing of tools" , "Agree on" .)

I've seen this clue in the Evening Standard.
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