Disappoint (4)

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3,4

let down

'disappoint' is the definition.
(synonyms)

This is all the clue.

(Other definitions for let down that I've seen before include "Disappoint, fail to support" , "Leave in the lurch" , "blow" , "Lower" , "Failed - to deflate a tyre - disappointed" .)

I've seen this clue in The Guardian and The Mirror.

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