Coastal inlet (4)
(Other definitions for bay that I've seen before include "Tree; horse; bark loudly" , "Part of sea" , "Sea inlet" , "Indentation of a shoreline" , "Reddish-brown horse" .)
'coastal inlet' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ria that I've seen before include "Irish academy for sciences and humanities, in short" , "Drowned river valley now an inlet of the sea" , "Drowned coastal valley" , "inlet between hills" , "Long narrow inlet" .)
'coastal inlet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cove that I've seen before include "Rum fellow found in a small inlet" , "Old fish" , "A small sea inlet or slangy man" , "sheltered recess at Lulworth?" , "Sheltered accommodation" .)