Crossword Genius

Common food that comes from no shops (4)

Ross

I believe the answer is:

nosh

I'm a little stuck... Click here to teach me more about this clue!

'common food' is the definition.
'nosh' can be an answer for 'food' (nosh is a kind of food). I'm not certain of the 'common' bit.

'no shops' is the wordplay.
'shops' becomes 'sh' (I can't justify this - if you can you should believe this answer much more).
'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)'" .)

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