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

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