Crossword Genius

Nothing in which to dip quill? Pen's sound! (4)

Ross

I believe the answer is:

oink

'pen's sound' is the definition.
(sound from a pig pen)

'nothing in which to dip quill?' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'in which to dip quill?' becomes 'ink' (historical writing implements).
'o'+'ink'='OINK'

(Other definitions for oink that I've seen before include "Pig's grunt" , "What farmer hears" , "Sound made by a pig" , "grunting sound" , "what we hear from Berkshire?" .)

I've seen this clue in The Telegraph.
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