Crossword Genius

Great flow under ground (9)

Ross

I believe the answer is:

wonderful

'great' is the definition.
(I've seen this before)

'flow under ground' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'flow'+'under'='flowunder'
'flowunder' anagrammed gives 'WONDERFUL'.

(Other definitions for wonderful that I've seen before include "Extraordinary" , "Marvellous" , "Superb" , "Fantastic, terrific" , "Great" .)

I've seen this clue in The Guardian.
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