Crossword Genius

Sceptic witnessing bank robbery? (7)

Ross

I believe the answer is:

atheist

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

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

'witnessing bank robbery?' is the wordplay.
'witnessing' becomes 'at' (I can't explain this - if you can you should give a lot more credence to this answer).
'bank robbery?' becomes 'heist' (I've seen this before).
'at'+'heist'='ATHEIST'

Can you help me to learn more?

(Other definitions for atheist that I've seen before include "One denies the existence of a god" , "Unfaithful type" , "Sceptic" , "Person who does not believe in existence of a god" , "One denies the existence of gods" .)

I've seen this clue in The Sun.
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