Legal student, for example, with sex appeal I partner (10)
I believe the answer is:
legitimate
'legal' is the definition.
(associated in meaning)
'student for example with sex appeal i partner' is the wordplay.
'student' becomes 'l' (as in L-plates for learner drivers).
'for example' becomes 'eg' (short for 'exempli gratia', 'for example' in Latin).
'with' is a charade indicator (letters next to each other).
'sex appeal' becomes 'it'.
'partner' becomes 'mate' (synonyms).
'l'+'eg'+'it'+'i'+'mate'='LEGITIMATE'
(Other definitions for legitimate that I've seen before include "Lawful" , "not breaking the law" , "Legal" , "Permitted" , "Kosher" .)