Be bold (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
dare
'be bold' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dare that I've seen before include "Have sufficient courage" , "Venture, have courage" , "Challenge to do something foolhardy" , "Be brave enough" , "Dan - - , 'Eagle' pilot" .)