15 across
Stops
son
joining
uncaring
god
worshippers
(7)
Stops son joining uncaring god worshippers (7)
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The definition is at the beginning of the clue.
How the clue works
The definition is Stops — ceases or refrains. For the wordplay, DEISTS are your uncaring god worshippers (believers in a detached, non-intervening god), and you slot S (abbreviation for son) inside to get DE-S-ISTS.