D'Arcy's character? (10)
I believe the answer is:
apostrophe
'character?' is the definition.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for apostrophe that I've seen before include "Mark showing omission of letters" , "in Charley's Aunt ?" , "Part of man's" , "At which point discarded letters" , "It may be superfluous on tradesman's sign" .)