Mutton dish (5,4)
I believe the answer is:
'mutton dish' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for irish stew that I've seen before include "Pale broth, usually of lamb and mixed vegetables" , "Traditional meat dish" , "National dish, boiled mutton, spuds and onions" , "Fare" , "Dish of meat, onions, potatoes etc" .)