Old footballer discussed wine store's popular product (4,6)
I believe the answer is:
best seller
'popular product' is the definition.
'best seller' can be an answer for 'product' (best seller is a kind of product). I'm not certain of the 'popular' bit.
'old footballer discussed wine store's' is the wordplay.
'old footballer' becomes 'best' (George Best, 1946-2005. I am not sure about the 'old' bit.).
'discussed' shows a homophone (sound like).
'wine store' becomes 'cellar' (I've seen this before).
'cellar' sounds like 'seller'.
'best'+'seller'='BEST-SELLER'
Can you help me to learn more?
(Other definitions for best seller that I've seen before include "What many people are buying" , "Book bought by many" , "Popular book" , "Blockbuster" , "Book bought in large numbers" .)