Not a word! More ruddy office equipment (8)
I believe the answer is:
shredder
'office equipment' is the definition.
(I've seen this before)
'not a word more ruddy' is the wordplay.
'not a word' becomes 'sh'.
'more ruddy' becomes 'redder' ('red' can be a synonym of 'ruddy').
'sh'+'redder'='SHREDDER'
(Other definitions for shredder that I've seen before include "Document destroyer" , "one destroys paper" , "Destroyer of documents" , "Device for destroying documents" , "piece of office equipment" .)