Shade of meaning (6)
I believe the answer is:
nuance
'shade of meaning' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for nuance that I've seen before include "Subtle shade of meaning" , "Slight difference in meaning etc" , "Delicate shade of difference" , "Delicate shade of meaning" , "Subtlety, nicety" .)