Crossword Genius

Twinkling beam (5)

Ross

I believe the answer is:

flash

I believe this is a double definition.

'twinkling' is the first definition.
('flash' can be a synonym of 'twinkling')

'beam' is the second definition.
(thesaurus)

(Other definitions for flash that I've seen before include "Short gleam of light" , "Streak" , "emblem on uniform" , "Momentary brightness" , "Conspicuously display" .)

I've seen this clue in The Telegraph.
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