Apply to (5)

I think it could be either:

Which length description are you looking for?:

refer

'apply to' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for refer that I've seen before include "Send or direct to a specialist" , "Direct elsewhere" , "Mention/allude (to)" , "Mention, cite" , "Freer (anag.)" .)

I've seen this clue in the LA Times, The New York Times and the Universal.

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