Bone tossed initially into Spanish dish (7)
I believe the answer is:
patella
'bone' is the definition.
(I've seen this before)
'tossed initially into spanish dish' is the wordplay.
'initially' says to take the initial letters.
'into' means one lot of letters goes inside another.
'spanish dish' becomes 'paella' (I've seen this before).
The first letter of 'tossed' is 't'.
't' placed into 'paella' is 'PATELLA'.
(Other definitions for patella that I've seen before include "Knee bone" , "showing a bit of leg" , "Joint cover" , "positioned on each knee" , "bit of body usually under trousers!" .)