River mouth (7)
'river mouth' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for estuary that I've seen before include "Broad river mouth" , "Weapon" , "Wide lower tidal part of a river" , "Wide part of a river where it nears the sea" , "Where tide meets stream" .)
'river mouth' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for delta that I've seen before include "Eg, outlet of the Nile" , "Fourth Greek letter? - area at river mouth" , "Area of distributaries at a river mouth" , "Fragmented estuary" , "Split river mouth system" .)