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 am not certain of the 'common' bit.
'no shops' is the wordplay.
'shops' becomes 'sh' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'no'+'sh'='NOSH'
'that comes from' acts as a 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)'" .)