Eating duck, unfortunately no diet health dish (4-2-3-4)
I believe the answer is:
toad-in-the-hole
'dish' is the definition.
(sausage and batter dish)
'eating duck unfortunately no diet health' is the wordplay.
'eating' is an insertion indicator.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'no'+'diet'+'health'='nodiethealth'
'nodiethealth' is an anagram of 'tadinthehole'.
'o' going inside 'tadinthehole' is 'TOAD-IN-THE-HOLE'.
(Other definitions for toad-in-the-hole that I've seen before include "Batter pudding containing sausages" , "Sausages baked in batter" , "Battered sausage" , "Bangers and batter" , "Sausage and batter dish" .)