Courage in battle (6)
I believe the answer is:
valour
'courage in battle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for valour that I've seen before include "Bravery in battle" , "Courage in battle" , "Discretion is said to be the better part of it" , "Exceptional or heroic courage" , "Great bravery" .)