Finish feature on charm (6)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
endear
'charm' is the definition.
(I've seen this before)
'finish feature on' is the wordplay.
'finish' becomes 'end' ('end' can be a synonym of 'finish').
'feature' becomes 'ear' (I've seen this in other clues).
'on' says to put letters next to each other.
'end'+'ear'='ENDEAR'
(Other definitions for endear that I've seen before include "Evoke love - charm" , "Make lovable or please" , "Neared (anag.)" , "Make attractive or lovable" , "Delight - please" .)