Mimic standard drivel (6)
I believe the answer is:
parrot
'mimic' is the definition.
(I've seen this before)
'standard drivel' is the wordplay.
'standard' becomes 'par' (standard of play in golf).
'drivel' becomes 'rot' (rot is a kind of drivel).
'par'+'rot'='PARROT'
(Other definitions for parrot that I've seen before include "The bird can mimic sounds" , "Sick as a -" , "Tropical bird, may talk" , "Spout" , "Imitative bird" .)