Radiate, as light (4)

I think it could be either:

Which length description are you looking for?:

emit

'radiate as light' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for emit that I've seen before include "Give off or discharge" , "Conductor; telegram (US)" , "Make audible sounds" , "shed" , "Small turtle" .)

I've seen this clue in the Newsday.

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