Is able to preserve a Spanish bar (7)
I believe the answer is:
cantina
'spanish bar' is the definition.
(I've seen this before)
'is able to preserve a' is the wordplay.
'is able to' becomes 'can' (I've seen this before).
'preserve' becomes 'tin' (tinning is a kind of preserving).
'can'+'tin'+'a'='CANTINA'
(Other definitions for cantina that I've seen before include "Spanish bar; Italian wine shop" , "rural Mexican bar" , "Bar in Spain (or Star Wars)" , "Spanish wine-shop" , "Concern for drinkers" .)