Though half amused, curate remained composed and dignified (6)
I believe the answer is:
sedate
'dignified' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for sedate that I've seen before include "Staid - teased (anag)" , "Calm and dignified in manner" , "Calm and demure" , "Unhurried; drug" , "Composed and staid" .)