Doubting Thomas (7)

I think it could be either:

sceptic

skeptic

'doubting thomas' is the definition.
(synonyms)

This is all the clue.

(Other definitions for sceptic that I've seen before include "He's hard to convince" , "One who doubts accepted opinions" , "One is inclined to doubt accepted opinions" , "Greek philosopher" , "One questioning accepted opinions" .)

I've seen this clue in the Penny Press, The Daily Mail and The Mirror.

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