Rib broken by English dairy product (4)
I believe the answer is:
brie
'dairy product' is the definition.
(Brie is an example)
'rib broken by english' is the wordplay.
'broken by' indicates anagramming the letters (a broken form of the letters).
'english' becomes 'E' (abbreviation).
'rib' with letters rearranged gives 'bri'.
'bri'+'e'='BRIE'
(Other definitions for brie that I've seen before include "French 8 across" , "Soft, creamy French cheese" , "dairy product" , "French cream cheese" , "Soft and creamy mild white cheese" .)