Jettison fish won ton (8)
I believe the answer is:
dumpling
'won ton' is the definition.
(thesaurus)
'jettison fish' is the wordplay.
'jettison' becomes 'dump' (I've seen this in another clue).
'fish' becomes 'ling' (ling is a kind of fish).
'dump'+'ling'='DUMPLING'
(Other definitions for dumpling that I've seen before include "Stew doughball" , "sort of pudding" , "Tasty ball of dough cooked in stew" , "fool!" , "a little fatty!" .)