Allowed to sound Latvian (3)

I believe the answer is:

let

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'allowed to' is the definition.
(to let something happen is to allow it)

I can't explain the remainder of the clue.

(Other definitions for let that I've seen before include "Allow, don't hinder" , "Allow; permit" , "Service that must be repeated" , "Allow; leased" , "Was inclined to ignore" .)

I've seen this clue in the Evening Standard.

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