Crossword Genius

Planet Earth's last wetland (5)

Ross

I believe the answer is:

marsh

'wetland' is the definition.
(I've seen this in another clue)

'planet earth's last' is the wordplay.
'planet' becomes 'mars' (Mars is a planet).
'last' says to take the final letters.
The last letter of 'earth' is 'h'.
'mars'+'h'='MARSH'

(Other definitions for marsh that I've seen before include "Waterlogged land" , "Bog, swamp" , "Fen" , "Swampland" , "eg Romney" .)

I've seen this clue in The Guardian.
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