A Parisian female with sex-appeal is not suitable (5)
I believe the answer is:
unfit
'not suitable' is the definition.
(I've seen this before)
'a parisian female with sex-appeal' is the wordplay.
'a parisian' becomes 'un'.
'female' becomes 'f' (abbreviation).
'with' is a charade indicator (letters next to each other).
'sex appeal' becomes 'it'.
'un'+'f'+'it'='UNFIT'
'is' acts as a link.
(Other definitions for unfit that I've seen before include "Ill - out of shape" , "Inapt" , "Not in good shape physically" , "In poor condition" , "In bad physical condition" .)