Lovely conclusion about listener (9)
I believe the answer is:
endearing
'lovely' is the definition.
(I know that lovely can be written as endearing)
'conclusion about listener' is the wordplay.
'conclusion' becomes 'ending' (synonyms).
'about' means one lot of letters goes inside another.
'listener' becomes 'ear' (body part which hears or listens).
'ending' going around 'ear' is 'ENDEARING'.
(Other definitions for endearing that I've seen before include "Engaging" , "delightful" , "Inspiring affection" , "Charming" , "Disarming" .)