Crossword Genius

Treeless plain with permanently frozen subsoil (6)

Ross

I believe the answer is:

tundra

(Other definitions for tundra that I've seen before include "Vast treeless plain in the arctic regions" , "Sub-polar treeless zone" , "Area of permafrost" , "Vast flat treeless zone" , "Area with frozen subsoi" .)

I've seen this clue in The Guardian.
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