Workers say nothing in opposition to such corporate guff (10,5)
I believe the answer is:
management speak
'corporate guff' is the definition.
(corporate or managerial jargon)
'workers say nothing in opposition to' is the wordplay.
I cannot quite see how this works, but
'workers' could be 'men' (men can mean staff or employees) and 'men' is located in the answer.
'say' could be 'speak' (synonyms) and 'speak' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'such' acts as a link.
(Another definition for management speak that I've seen is " bull?".)