Married island girl from south, easily persuaded (9)
I believe the answer is:
malleable
'easily persuaded' is the definition.
(easy to mould or influence)
'married island girl from south' is the wordplay.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'island' becomes 'Elba' (Italian island).
'girl' becomes 'ella' (girl's name).
'from south' says the letters should be written in reverse.
'elba'+'ella'='elbaella'
'elbaella' backwards is 'alleable'.
'm'+'alleable'='MALLEABLE'
(Other definitions for malleable that I've seen before include "Able to be shaped" , "Compliant" , "Soft" , "Able to be hammered" , "Tractable" .)