Short Greek island sausage (6)
I believe the answer is:
salami
'sausage' is the definition.
(I know that salami is a type of summer sausage)
'short greek island' is the wordplay.
'short' means to remove the last letter.
'greek island' becomes 'salamis' (I've seen this before).
'salamis' with its last letter taken away is 'SALAMI'.
(Other definitions for salami that I've seen before include "Highly-seasonal sausage" , "Strongly flavoured Italian sausage" , "Slim, graceful" , "A highly seasoned type of sausage" , "Cured meat" .)