French cheese that is behind British (4)
I believe the answer is:
brie
'french cheese' is the definition.
(brie is a French cheese)
'that is behind british' is the wordplay.
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'behind' says to put letters next to each other.
'british' becomes 'br' (abbreviation for British).
'ie' after 'br' is 'BRIE'.
(Other definitions for brie that I've seen before include "Prov. squalid place" , "Soft and creamy mild white cheese" , "French cream cheese" , "Kind of soft cheese" , "French produce" .)