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 Mirror, the USA Today, The Star Tribune, the Penny Press, The Times, The Washington Post, the Universal, the King Feature Syndicate, The Independent and the Evening Standard.

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