Garlic sausage originally sold in island west of Athens (7)
I believe the answer is:
salamis
'island west of athens' is the definition.
(Greek island west of Athens)
'garlic sausage originally sold' is the wordplay.
'garlic sausage' becomes 'salami' (I've seen this before).
'originally' indicates taking the first letters.
The initial letter of 'sold' is 's'.
'salami'+'s'='SALAMIS'
'in' is the link.
(Other definitions for salamis that I've seen before include "Greek victory over Persians (four hundred and eighty BC), sausages" , "they're cured!" , "Greek island" , "historic naval engagement" , "Highly seasoned sausages" .)