Briny body of water (3)
I believe the answer is:
sea
'briny body of water' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sea that I've seen before include "Lesser ocean" , "Body of saltwater" , "Large body of salt water" , "7 [ship] s on this" , "eg Dead, Red" .)