Leave Adriatic port (5)
I believe the answer is:
split
I believe this is a double definition.
'leave' is the first definition.
(I've seen this before)
'adriatic port' is the second definition.
(I've seen this before)
(Other definitions for split that I've seen before include "Dalmatian port" , "Break open suddenly" , "Tear" , "Separate or cut with a tool" , "Diverge" .)