Crossword Genius

Grunt, seeing old writing material (4)

Ross

I believe the answer is:

oink

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

'old writing material' is the wordplay.
'old' becomes 'o' (abbreviation as in OT - Old Testament).
'writing material' becomes 'ink' (substance for writing with).
'o'+'ink'='OINK'

'seeing' acts as a link.

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

I've seen this clue in The Telegraph.
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