Spirit, resilience (6)
I believe the answer is:
mettle
This clue is a double definition.
'spirit' is the first definition.
(I know that mettle is a type of braveness)
'resilience' is the second definition.
(I've seen this before)
(Other definitions for mettle that I've seen before include "boldness" , "Pluck" , "Bravery" , "Spirit, resilience" , "Fortitude" .)