Biblical sea (7)
I believe the answer is:
galilee
'biblical sea' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for galilee that I've seen before include "Holy land lake; church porch" , "part of Holy Land" , "Sea of . . . . . . . is a Biblical lake now in Israel" , "Holy land area" , "Biblical sea known to Jesus" .)