Censor depressed writer (4-6)

I believe the answer is:

blue-pencil

'censor' is the definition.
(I've seen this before)

'depressed writer' is the wordplay.
'depressed' becomes 'blue' (I've seen this before).
'writer' becomes 'pencil' (something which writes).
'blue'+'pencil'='BLUE-PENCIL'

(Another definition for blue-pencil that I've seen is " Censor".)

I've seen this clue in The Guardian.

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