Run a short fiddle in cases of meat (7)
I believe the answer is:
ravioli
'cases of meat' is the definition.
'ravioli' can be an answer for 'cases' (I've seen this before). I am not sure about the 'of meat' bit.
'run a short fiddle in' is the wordplay.
'run a short' becomes 'rai' (I can't explain this - if you can you should believe this answer much more).
'fiddle' becomes 'viol' (I have seen 'Early fiddle ' mean 'viol' so perhaps 'fiddle' could also mean 'viol').
'in' is an insertion indicator.
'rai' enclosing 'viol' is 'RAVIOLI'.
Can you help me to learn more?
(Other definitions for ravioli that I've seen before include "Italian food" , "Pasta with savoury stuffing" , "Paganini might have made a meal of this" , "Pasta pockets" , "Filled pasta squares" .)