Expel from Mediterranean island (7)
I believe the answer is:
excrete
'expel' is the definition.
(excreting is a kind of expelling)
'from mediterranean island' is the wordplay.
'from' becomes 'ex'.
'mediterranean island' becomes 'crete' (I've seen this before).
'ex'+'crete'='EXCRETE'
(Other definitions for excrete that I've seen before include "Expel (waste) from the body" , "Defecate" , "Eliminate (from the body)" .)