Conclude with a feature on charm (6)
I believe the answer is:
endear
'charm' is the definition.
(I've seen this before)
'conclude with a feature' is the wordplay.
'conclude' becomes 'end' (I've seen this in another clue).
'with' means one lot of letters go next to another.
'a feature' becomes 'ear' (ears are a facial feature).
'end'+'ear'='ENDEAR'
'on' is the link.
(Other definitions for endear that I've seen before include "Delight - please" , "Evoke love - charm" , "Make attractive or lovable" , "Cause to be beloved" , "Neared (anag.)" .)