Some food's outside (4)
I believe the answer is:
rind
'outside' is the definition.
(I've seen this before)
'some food's' is the wordplay.
'some' becomes 'rin' (I can't explain this - if you can you should give a lot more credence to this answer).
'food' becomes 'd' (D is an example).
'rin'+'d'='RIND'
Can you help me to learn more?
(Other definitions for rind that I've seen before include "Fruit skijn as of orange" , "Outer layer (of cheese)" , "Hard outer skin, of an orange say" , "Tough outer layer" , "outside" .)