Old, old boy turning up in wine-shop (6)
I believe the answer is:
bodega
'wine-shop' is the definition.
(I've seen this before)
'old old boy turning up' is the wordplay.
'old' becomes 'aged' ('aged' can be similar in meaning to 'old').
'old boy' becomes 'ob'.
'turning up' shows that the letters should be reversed in order.
'aged'+'ob'='agedob'
'agedob' backwards is 'BODEGA'.
'in' is the link.
(Other definitions for bodega that I've seen before include "booze shop" , "Spanish wine cellar" , "Liquor store" , "Wine-shop in a Spanish-speaking country" , "warehouse for wine" .)