Work attitude to resist (6)
I believe the answer is:
oppose
'resist' is the definition.
(thesaurus)
'work attitude' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'attitude' becomes 'pose' (I've seen this before).
'op'+'pose'='OPPOSE'
'to' acts as a link.
(Other definitions for oppose that I've seen before include "Obstruct, resist" , "Actively resist" , "'Refute, stand against (6)'" , "match" , "Resist, go against" .)