Land some water ravages? (5)
I believe the answer is:
terra
'land' is the definition.
(I've seen this before)
'some water ravages?' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'TERRA' is hidden within 'water ravages'.
(Other definitions for terra that I've seen before include "Centre" , "Latin word for earth" , "Legally land" , "Land (Latin)" , "-- Firma; -- incognita" .)