Charmer from south unsettled and mischievous at heart (8)
I believe the answer is:
smoothie
'charmer' is the definition.
('smoothie' can be a synonym of 'charmer')
'south unsettled and mischievous at heart' is the wordplay.
'south unsettled' becomes 'smoot' (I am not sure about this - if you are sure you should believe this answer much more).
'and' says to put letters next to each other.
'at heart' says to take the centre.
The middle letters of 'mischievous' are 'hie'.
'smoot'+'hie'='SMOOTHIE'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for smoothie that I've seen before include "Plausible person" , "Drink made with pur?ed fruit" , "Fruit pured with milk" , "Sweet talker" , "Drink made with pureed fruit" .)