Dish including T-bone (7)
I believe the answer is:
patella
'bone' is the definition.
(patella is a kind of bone)
'dish including t' is the wordplay.
'dish' becomes 'paella' (type of meal).
'including' is an insertion indicator.
'paella' enclosing 't' is 'PATELLA'.
(Other definitions for patella that I've seen before include "positioned on each knee" , "bit of body usually under trousers!" , "The formal kneecap" , "showing a bit of leg" , "Kneecap (anatomy)" .)