Composed manner (5)
I believe the answer is:
poise
'composed manner' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for poise that I've seen before include "Grace; equilibrium" , "Dignity and assurance of manner" , "Coolness and composure under strain" , "Graceful and elegant bearing in a person" , "Aplomb" .)