Crossword Genius

Like non-believers at robbery, originally in California (11)

Ross

I believe the answer is:

atheistical

'like non-believers' is the definition.
(atheists don't believe in God)

'at robbery originally in california' is the wordplay.
'robbery' becomes 'heist' (heist is a kind of robbery).
'originally' says to take the initial letters.
'california' becomes 'cal' (short for California).
The initial letter of 'in' is 'i'.
'at'+'heist'+'i'+'cal'='ATHEISTICAL'

I've seen this clue in The Times.
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