Composed? Some composed, at ease (6)
I believe the answer is:
sedate
'composed?' is the definition.
(thesaurus)
'some composed at ease' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SEDATE' is hidden within 'composed at ease'.
(Other definitions for sedate that I've seen before include "Calm; put to sleep" , "Staid - tranquillise" , "Unhurried; drug" , "Slow" , "Collected" .)