Draw conclusion on organ (6)
I believe the answer is:
endear
'draw' is the definition.
(I've seen this before)
'conclusion on organ' is the wordplay.
'conclusion' becomes 'end' (something's conclusion is its end).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'organ' becomes 'ear' (the ear is an organ).
'end'+'ear'='ENDEAR'
(Other definitions for endear that I've seen before include "Neared so as to make loved" , "ingratiate" , "Neared in order to charm" , "Make popular" , "Arouse affection" .)