Suggestion, tinge (6)
I believe the answer is:
nuance
I believe this clue is a double definition.
'suggestion' is the first definition.
(thesaurus)
'tinge' is the second definition.
(thesaurus)
(Other definitions for nuance that I've seen before include "Subtle shade of meaning" , "Ace nun (anag)" , "A hint or shade" , "Subtlety, nicety" , "Subtle shade of difference" .)