Sweetly charming (7)
I believe the answer is:
winsome
'sweetly charming' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for winsome that I've seen before include "Agreeable" , "Charming, engaging" , "Appealingy attractive" , "Attractive - I'm so new (anag)" , "Pleasant" .)