Repeat the usual nonsense (6)
I believe the answer is:
parrot
'repeat' is the definition.
(parroting is a kind of repeating)
'the usual nonsense' is the wordplay.
'the usual' becomes 'par'.
'nonsense' becomes 'rot' (I've seen this before).
'par'+'rot'='PARROT'
(Other definitions for parrot that I've seen before include "Imitative bird" , "Psittacine bird" , "Mimic speech like colourful bird" , "birdie" , "Mimic like exotic bird" .)