Is bold enough (5)
I believe the answer is:
dares
'is bold enough' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dares that I've seen before include "Has the courage to do brave or dangerous thing" , "Risks" , "Ventures" , "''Who ..., wins'' (SAS motto)" , "Challenges to do something dangerous" .)