Suggestion from sister without a church (6)
I believe the answer is:
nuance
'suggestion' is the definition.
(thesaurus)
'sister without a church' is the wordplay.
'sister' becomes 'nun' (sister is a term of address for a nun).
'without' means one lot of letters goes inside another ('without' can be similar in meaning to 'outside').
'church' becomes 'CE' (abbreviation for Church of England).
'nun' going around 'a' is 'nuan'.
'nuan'+'ce'='NUANCE'
'from' is the link.
(Other definitions for nuance that I've seen before include "Subtlety of meaning" , "Subtlety, nicety" , "Slight difference in meaning etc" , "Subtle shade of meaning" , "Subtle difference of meaning" .)