Here one finds shops are stocked by rotter (6)
I believe the answer is:
arcade
'here one finds shops' is the definition.
'arcade' can be an answer for 'shops' (I've seen this before). I'm not sure about the 'here one finds' bit.
'are stocked by rotter' is the wordplay.
'stocked' means one lot of letters goes inside another.
'by rotter' becomes 'cad' (I've seen this in another clue. I am not sure about the 'by' bit.).
'are' enclosing 'cad' is 'ARCADE'.
Can you help me to learn more?
(Other definitions for arcade that I've seen before include "Covered walkway with shops" , "Covered area with shops and stalls" , "Covered passage of e.g. shops" , "Shops in row" , "where 'penny' often drops" .)