Doesn't hesitate (4)
I believe the answer is:
acts
'doesn't hesitate' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acts that I've seen before include "Cast (anag) - performs" , "the entertainment for a revue?" , "Cast in major play sections" , "Pretends" , "these for variety show" .)