Composed - composed at each part (6)
I believe the answer is:
sedate
'composed' is the definition.
(I've seen this before)
'composed at each part' is the wordplay.
'part' says the answer is hidden in the clue.
'SEDATE' is hidden in the letters of 'composed at each'.
(Other definitions for sedate that I've seen before include "not disturbed by passion or excitement?" , "Dignified and sombre" , "Give tranquilliser to" , "Calm and demure" , "Dignified and subdued" .)