Crossword Genius

Faithless types witnessing robberies? (8)

Ross

I believe the answer is:

atheists

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'faithless types' is the definition.
(atheists don't believe in god)

'witnessing robberies?' is the wordplay.
'witnessing' becomes 'at' (I can't explain this - if you can you should give a lot more credence to this answer).
'robberies?' becomes 'heists' (heist is a kind of robbery).
'at'+'heists'='ATHEISTS'

Can you help me to learn more?

(Other definitions for atheists that I've seen before include "They believe deities don't exist" , "ungodly crew" , "Godless people" , "Disbelievers in god" , "Non-believers" .)

I've seen this clue in The Telegraph.
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