Calm, having made up? (8)
I believe the answer is:
composed
I believe this clue is a double definition.
'calm' is the first definition.
(similar in meaning)
'made up?' is the second definition.
(composing is a kind of making up)
'having' acts as a link.
(Other definitions for composed that I've seen before include "Field did" , "arranged" , "Unruffled" , "as score must be" , "Calm; created music" .)