Child of five with this French fruit (6)
I believe the answer is:
quince
'fruit' is the definition.
(quince is a kind of fruit)
'child of five with this french' is the wordplay.
'child of five' becomes 'quin' (I've seen this before).
'with' says to put letters next to each other.
'this french' becomes 'ce' (I've seen this in other clues).
'quin'+'ce'='QUINCE'
(Other definitions for quince that I've seen before include "Golden fruit" , "Peter --- (MND); fruit" , "Acid pear-shaped fruit used in preserves" , "tree" , "Fruity" .)