They say your writer will land in water (4)
I believe the answer is:
isle
'land in water' is the definition.
(an isle is a bit of land surrounded by water)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for isle that I've seen before include "Geographic location" , "Fair one is in shipping bulletin" , "Little land" , "Atoll" , "The Lake ... of Innisfree (W.B.Yeats)" .)