Adriatic and Aegean (4)
I believe the answer is:
seas
'adriatic and aegean' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seas that I've seen before include "Aegean and Mediterranean, say" , "Bodies of salt water" , "Red and Black are" , "Red and Dead" , "Oceans" .)