All ape cooked was a rice dish (6)
I believe the answer is:
paella
'a rice dish' is the definition.
(I've seen this before)
'all ape cooked' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'all'+'ape'='allape'
'allape' is an anagram of 'PAELLA'.
'was' is the link.
(Other definitions for paella that I've seen before include "Spanish dish of rice, chicken, seafood etc cooked in a pan" , "course in Granada?" , "Saffron-flavoured rice dish" , "something to eat" , "Fare for Spaniard" .)