Bestseller list affected some local shops (3,6)
I believe the answer is:
hit parade
'list affected some local shops' is the definition.
'hit parade' can be an answer for 'list' (I have seen 'list of winners' mean 'hit parade' so perhaps 'list' could also mean 'hit parade'). I am not sure about the 'affected some local shops' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hit parade that I've seen before include "Top-selling numbers" , "Selling CDs" , "Pop charts" , "list of winners" , "Those once charting" .)