Ray of light (4)

I think it could be either:

Which length description are you looking for?:

beam

'ray of light' is the definition.
(I know this)

This is the entire clue.

(Other definitions for beam that I've seen before include "Radiant smile; timber support" , "Shine" , "Supporting structure" , "XWD SETTER" , "Ray of light or a large smile" .)

I've seen this clue in the King Feature Syndicate, The Mirror, The Independent and the Evening Standard.

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