Ancient old boy turning up in wine shop (6)
I believe the answer is:
bodega
'wine shop' is the definition.
(I've seen this before)
'ancient old boy turning up' is the wordplay.
'ancient' becomes 'aged' (I've seen this before).
'old boy' becomes 'ob'.
'turning up' is a reversal indicator.
'aged'+'ob'='agedob'
'agedob' in reverse letter order is 'BODEGA'.
'in' acts as a link.
(Other definitions for bodega that I've seen before include "Span. wine shop" , "concern for alcohol" , "Small Spanish grocery and wine store" , "Spanish wine-shop" , "Small Hispanic wine-shop" .)