Gutsy (6)
I believe the answer is:
plucky
'gutsy' is the definition.
(I know that gutsy can be written as plucky)
This is all the clue.
(Other definitions for plucky that I've seen before include "Brave against odds" , "Showing determination in the face of difficulty" , "Feisty, gutsy" , "Brave, showing courage" , "with bottle" .)