Crossword Genius

He doesn't believe in Castro (7)

Ross

I believe the answer is:

infidel

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'he doesn't believe' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'in castro' is the wordplay.
'castro' becomes 'fidel' (Fidel Castro famous ruler of Cuba).
'in'+'fidel'='INFIDEL'

Can you help me to learn more?

(Other definitions for infidel that I've seen before include "Person who does not believe in a religion" , "Person who has no faith, or the wrong one" , "One without religion (mainly archaic)" , "Person who rejects a religious belief" , "Person not operating in good faith" .)

I've seen this clue in the Sydney Morning Herald and the Evening Standard.
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