House one French girl in Cockney district (8)
I believe the answer is:
bungalow
'house' is the definition.
(I know that bungalow is a type of house)
'one french girl in cockney district' is the wordplay.
'one french' becomes 'un' ('one' in French).
'girl' becomes 'gal' (synonyms).
'in' indicates putting letters inside.
'cockney district' becomes 'bow' (area of London).
'un'+'gal'='ungal'
'ungal' inserted into 'bow' is 'BUNGALOW'.
(Other definitions for bungalow that I've seen before include "A blowgun (anag.)" , "One-storeyed building" , "One-storeyed home" , "A one-storey dwelling house" , "Single-storey home" .)