Beam of light (3)

I think it could be either:

Which length description are you looking for?:

ray

'beam of light' is the definition.
(synonyms)

This is all the clue.

(Other definitions for ray that I've seen before include "may be electric" , "Pencil of light" , "Flat fish or sun beam" , "beamer?" , "Shaft of light" .)

I've seen this clue in the Evening Standard, The Star Tribune, The Washington Post, The Independent, the Penny Press, the USA Today, the Universal, The Times, The Mirror and the King Feature Syndicate.

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