Parisian who half chewed flan (6)
I believe the answer is:
quiche
'flan' is the definition.
(type of flan)
'parisian who half chewed' is the wordplay.
'parisian who' becomes 'qui' ('who' in French).
'half' means to take half the letters.
'chewed' cut in half is 'che'.
'qui'+'che'='QUICHE'
(Other definitions for quiche that I've seen before include "Savoury tart with egg-based filling" , "Vegetarian tart (not eaten by a real man?)" , "Open tart with savoury egg filing" , "Open tart with egg filling" , "Cheese and bacon pastry dish" .)