Choice feature (6)
I believe the answer is:
nicety
'choice feature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nicety that I've seen before include "Judged to a . . . . . . - with precision" , "Refinement" , "Delicacy" , "Matter of delicate adjustment" , "Finesse" .)