Crossword Genius

No believer observing robbery? (7)

Ross

I believe the answer is:

atheist

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

'no believer' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'observing robbery?' is the wordplay.
'observing' becomes 'at' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'robbery?' becomes 'heist' (heist is a kind of robbery).
'at'+'heist'='ATHEIST'

Can you help me to learn more?

(Other definitions for atheist that I've seen before include "Disbeliever in gods" , "Godless person" , "Person who does not believe in existence of a god" , "I don't believe" , "Unfaithful type" .)

I've seen this clue in The Sun.
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