Land amid water (4)
I believe the answer is:
isle
'land amid water' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for isle that I've seen before include "Ait" , "Man, for one" , "The Emerald - (Ireland)" , "Said of Sheppey, Dogs, Wight or Man?" , "Such as Man or Bute" .)