Crossword Genius

Sort of ground farmers opt to change (10)

Ross

I believe the answer is:

permafrost

'sort of ground' is the definition.

'farmers opt to change' is the wordplay.
'to change' indicates an anagram.
'farmers'+'opt'='farmersopt'
'farmersopt' with letters rearranged gives 'PERMAFROST'.

(Other definitions for permafrost that I've seen before include "Ground frozen for a long time" , "Hard layer" , "Ground never thawing" , "feature of polar regions" .)

I've seen this clue in The Telegraph.
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