Grace under fire (5)
I believe the answer is:
poise
'grace under fire' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for poise that I've seen before include "Dignified and self-assured manner" , "cool" , "Graceful and elegant bearing in a person" , "Elegance" , "Dignity; equilibrium" .)