Resist boldly (4)
I believe the answer is:
defy
'resist boldly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for defy that I've seen before include "Withstand" , "Flout" , "Refuse to obey (person)" , "Openly resist or refuse to obey" , "Boldly resist (authority, etc)" .)