Subtlety (6)
'subtlety' is the definition.
(synonyms)
This is all the clue.
(Other definitions for nuance that I've seen before include "Subtle difference of meaning" , "Subtle shade of difference" , "Slight difference in meaning etc" , "Fine distinction" , "A slight shade or trace" .)
'subtlety' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for finesse that I've seen before include "Subtly skilful handling of a situation" , "Subtle elegance" , "Delicate manipulation of a situation - perhaps at cards" , "Clever or crafty manoeuvring" , "Artifice" .)