Charm listener -- first aim (6)
I believe the answer is:
endear
'charm' is the definition.
(I've seen this before)
'listener first aim' is the wordplay.
'listener' becomes 'ear' (I've seen this before).
'first' means one lot of letters go next to another.
'aim' becomes 'end' (I've seen this before).
'ear' after 'end' is 'ENDEAR'.
(Other definitions for endear that I've seen before include "Inspire affection" , "Draw" , "ingratiate" , "Win over" , "Make fond" .)