There’s a vibration and a flash (5)

I believe the answer is:

shake

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'a flash' is the definition.
(thesaurus)

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

(Other definitions for shake that I've seen before include "Tremble; milk drink" , "moment" , "Shiver" , "Quiver" , "rock" .)

I've seen this clue in the Evening Standard.

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