*Self-assured (6)
I believe the answer is:
poised
'self-assured' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for poised that I've seen before include "Having dignified self-assured manner" , "Balanced or braced" , "Balanced or self-confident" , "Showing self-assurance" , "Composed and self-assured" .)