Dish a part for extra violin (7)
I believe the answer is:
ravioli
'dish' is the definition.
(I've seen this before)
'a part for extra violin' is the wordplay.
'a part' says the answer is hidden in the clue.
'RAVIOLI' is hidden within 'for extra violin'.
(Other definitions for ravioli that I've seen before include "Small, filled cases of dough" , "dish in the trattoria" , "Pasta pillows" , "which Verdi may have put away" , "Meat-filled pasta squares" .)