Crossword Genius

Sign coat damaged? I'm sceptical (8)

Ross

I believe the answer is:

agnostic

I'm a little stuck... Click here to teach me more about this clue!

'i'm sceptical' is the definition.
I can't tell whether this defines the answer.

'sign coat damaged?' is the wordplay.
'damaged?' is an anagram indicator.
'sign'+'coat'='signcoat'
'signcoat' is an anagram of 'AGNOSTIC'.

Can you help me to learn more?

(Other definitions for agnostic that I've seen before include "someone like Pyrrho" , "One believing we can know nothing of the existence of any god" , "Coasting away with non-believer" , "One believing nothing can be known of the nature of God" , "uncertain about what to believe" .)

I've seen this clue in The Telegraph.
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