Notes farm equipment has critic (9)
I believe the answer is:
detractor
'critic' is the definition.
(I've seen this before)
'notes farm equipment' is the wordplay.
'notes' becomes 'de' (two musical notes).
'farm equipment' becomes 'tractor'.
'de'+'tractor'='DETRACTOR'
'has' is the link.
(Other definitions for detractor that I've seen before include "Critic" , "One belittling" , "I make uncomplimentary remarks" , "one responsible for mud flying around" , "Slighter" .)