Conclusion gives listener cause to be loved (6)
I believe the answer is:
endear
'cause to be loved' is the definition.
(I've seen this before)
'conclusion gives listener' is the wordplay.
I cannot quite understand how this works, but
'conclusion' could be 'end' (something's conclusion is its end) and 'end' is located in the answer.
'listener' could be 'ear' (body part which hears or listens) and 'ear' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for endear that I've seen before include "Make love" , "Make beloved" , "Attract" , "Win over" , "Make attractive or lovable" .)