Charm listener by the finish (6)
I believe the answer is:
endear
'charm' is the definition.
(I've seen this before)
'listener by the finish' is the wordplay.
'listener' becomes 'ear' (I've seen this before).
'by' means one lot of letters go next to another.
'the finish' becomes 'end' (I've seen this in other clues).
'ear' put after 'end' is 'ENDEAR'.
(Other definitions for endear that I've seen before include "make sweet" , "Cause to be loved" , "Neared in order to charm" , "Earned (anag.)" , "Draw" .)