Grouse stew a strong, rancid dish (4,10)
I believe the answer is:
beef stroganoff
'dish' is the definition.
(I've seen this before)
'grouse stew a strong rancid' is the wordplay.
'grouse' becomes 'beef' ('beef' can be a synonym of 'grouse'**).
'stew' indicates anagramming the letters.
'rancid' becomes 'off' (I've seen this before).
'a'+'strong'='astrong'
'astrong' with letters rearranged gives 'strogan'.
'beef'+'strogan'+'off'='BEEF STROGANOFF'
(Other definitions for beef stroganoff that I've seen before include "Meat dish" , "Dish with sour cream sauce" .)