Non-believer at robbery (7)

I believe the answer is:

atheist

'non-believer' is the definition.
(someone who doesn't believe in God)

'at robbery' is the wordplay.
'robbery' becomes 'heist' (heist is a kind of robbery).
'at'+'heist'='ATHEIST'

(Other definitions for atheist that I've seen before include "Person who believes there is no God" , "Unbeliever" , "One who does not believe in the existence of a god" , "One doesn't believe" , "God denier" .)

I've seen this clue in The Irish Independent.

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