stick it out (6)
I believe the answer is:
endure
'stick it out' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for endure that I've seen before include "Bear something patiently" , "Last or suffer patiently" , "Put up with, say hardship" , "Bear, suffer" , "Undergo hardship patiently" .)