Crossword Genius

One doubts a costing is wrong (8)

Ross

I believe the answer is:

agnostic

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

'a costing is wrong' is the wordplay.
'is wrong' indicates an anagram.
'costing' is an anagram of 'gnostic'.
'a'+'gnostic'='AGNOSTIC'

(Other definitions for agnostic that I've seen before include "He finds it difficult to believe" , "Unbeliever; sceptic" , "Song I act (anag)" , "Coasting away with non-believer" , "Religious sceptic" .)

I've seen this clue in The Sun.
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