Wife has terrible stew dish (5,7)
I believe the answer is:
welsh rarebit
'dish' is the definition.
(Welsh rarebit is an example)
'wife has terrible stew' is the wordplay.
'wife' becomes 'w'.
'stew' indicates an anagram.
'has'+'terrible'='hasterrible'
'hasterrible' anagrammed gives 'elshrarebit'.
'w'+'elshrarebit'='WELSH RAREBIT'
(Other definitions for welsh rarebit that I've seen before include "Toasted snack" , "Cheesy dish" , "Cheese on toast" , "cheesy meal" .)