A crushing remark you consign to paper (3-4)

I believe the answer is:

put-down

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'a crushing remark' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for put-down that I've seen before include "Humiliating remark" , "Snub" , "Crushing remark" .)

I've seen this clue in the Evening Standard.

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