Common food that comes from no shops (4)
I believe the answer is:
nosh
'common food' is the definition.
'nosh' can be an answer for 'food' (nosh is a kind of food). I'm not sure about the 'common' bit.
'no shops' is the wordplay.
'shops' becomes 'sh' (I can't explain this - if you can you should believe this answer much more).
'no'+'sh'='NOSH'
'that comes from' is the link.
Can you help me to learn more?
(Other definitions for nosh that I've seen before include "Fare" , "Eat (slang) -- food (slang)" , "Eat (sl.)" , "Food (coll)" , "'Food, grub (4)'" .)