It may hint a nun is about to join the church (6)
I believe the answer is:
nuance
'it may hint' is the definition.
The definition suggests a singular noun which matches the answer.
'a nun is about to join the church' is the wordplay.
'is about' means one lot of letters goes inside another.
'to join' means one lot of letters go next to another.
'the church' becomes 'CE' (abbreviation for Church of England).
'a' inserted into 'nun' is 'nuan'.
'nuan'+'ce'='NUANCE'
Can you help me to learn more?
(Other definitions for nuance that I've seen before include "A hint or shade" , "A slight shade or trace" , "A slight shade as of meaning" , "Subtle difference of meaning" , "Subtle distinction or variation" .)