Crossword Genius

Change of blue soil (6)

Ross

I believe the answer is:

befoul

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

'change of blue' is the wordplay.
'change' indicates an anagram.
'of'+'blue'='ofblue'
'ofblue' is an anagram of 'BEFOUL'.

(Other definitions for befoul that I've seen before include "Soil, defile" , "Make dirty" , "Pollute" .)

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