Peninsula and related port in the Med (7)
I believe the answer is:
kintyre
'peninsula' is the definition.
(Scottish peninsula)
'related port in the med' is the wordplay.
'related' becomes 'kin' ('kin' can be similar in meaning to 'related').
'port in the med' becomes 'tyre' (Lebanese city).
'kin'+'tyre'='KINTYRE'
'and' acts as a link.
(Other definitions for kintyre that I've seen before include "Mull of -- (song)" , "Mull of -------, 1977 UK No1 for Wings" , "Mull of - (W. Scotland)" , "Peninsula in western Scotland" .)