Make charming final piece on organ (6)
I believe the answer is:
endear
'make charming' is the definition.
I can't judge whether this definition defines the answer.
'final piece on organ' is the wordplay.
'final piece' becomes 'end' (I've seen this in another clue).
'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'
Can you help me to learn more?
(Other definitions for endear that I've seen before include "Make loveable" , "Evoke love - charm" , "Make popular" , "Cause to like" , "Neared (anag.)" .)