A real cat cooked according to menu? (1,2,5)
I believe the answer is:
a la carte
'menu?' is the definition.
(a la carte is a kind of menu)
'a real cat cooked' is the wordplay.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'real'+'cat'='realcat'
'realcat' anagrammed gives 'lacarte'.
'a'+'lacarte'='A LA CARTE'
'according to' acts as a link.
(Other definitions for a la carte that I've seen before include "Menu with individually priced dishes" , "(Of menu) listing individual items" , "offering unrestricted choice" , "Like single menu dishes" , "Unrestricted in restaurant choice" .)