Show gumption (4)
I believe the answer is:
dare
'show gumption' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dare that I've seen before include "Be courageous enough to try or do" , "Be brave enough" , "Have the courage to try something" , "Challenge of courage" , "Challenge to do something foolhardy" .)