Go against (6)
'go against' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for oppose that I've seen before include "Compete with" , "Resist, be hostile to" , "Resist; play against" , "Actively resist" , "Resist; disapprove of" .)
'go against' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for defy that I've seen before include "Openly resist or refuse to obey" , "Stand against" , "Flout" , "Refuse to obey (person)" , "Resist (someone) openly" .)