Lowest lake in the world (4,3)
I believe the answer is:
dead sea
'lowest lake in the world' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for dead sea that I've seen before include "Lake of Jordan/Israel" , "Salt lake fed by the Jordan river" , "Middle East saltwater lake, almost 1,300 feet below sea level" , "Inland salt lake on Israel-Jordan border" , "Saltwater lake in the Jordan valley" .)