Singing girl stops to expose (9)
I believe the answer is:
barcarole
'singing' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'girl stops to expose' is the wordplay.
'girl' becomes 'carol' (woman's name).
'stops' means one lot of letters goes inside another.
'to expose' becomes 'bare' (baring is a kind of exposing).
'carol' placed into 'bare' is 'BARCAROLE'.
Can you help me to learn more?
(Other definitions for barcarole that I've seen before include "Venetian boat song" , "Gondolier's song" , "musical composition" , "music of Venice" , "Venetian boating song" .)