Core; courage (5)
I believe the answer is:
heart
This clue is a double definition.
'core' is the first definition.
(I know that core can be written as heart)
'courage' is the second definition.
(I know that heart is a type of courage)
(Other definitions for heart that I've seen before include "Spirit - core" , "Cardiac courage" , "Body organ" , "show enthusiasm" , "Vital organ - centre - courage" .)