Captivate the last listener (6)
I believe the answer is:
endear
'captivate' is the definition.
(thesaurus)
'the last listener' is the wordplay.
'the last' becomes 'end'.
'listener' becomes 'ear' (I've seen this before).
'end'+'ear'='ENDEAR'
(Other definitions for endear that I've seen before include "Evoke love - charm" , "Cause to be beloved" , "inspire love" , "Neared (anag.)" , "Cause to like" .)