Crossword Genius

Wrong, or sure one is wrong (9)

Ross

I believe the answer is:

erroneous

'is wrong' is the definition.
(similar in meaning)

'wrong or sure one' is the wordplay.
'wrong' indicates anagramming the letters.
'or'+'sure'+'one'='orsureone'
'orsureone' anagrammed gives 'ERRONEOUS'.

(Other definitions for erroneous that I've seen before include "Mistaken, in error" , "not right" , "Mistaken - inaccurate" , "Incorrect, wrong" , "with mistakes" .)

I've seen this clue in The Telegraph.
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