Give permission to (3)

I think it could be either:

Which length description are you looking for?:

let

'give permission to' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for let that I've seen before include "Was inclined to ignore" , "Allow, don't hinder" , "Permit; lease" , "Rent out: grant" , "Won't stop you" .)

I've seen this clue in The Mirror, The Sun, the Universal, the LA Times and The Wall Street Journal.

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