English chap rejecting mother's code of beliefs (5)

I believe the answer is:

ethos

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'beliefs' is the definition.
(set of beliefs)

I can't explain the rest of the clue.

(Other definitions for ethos that I've seen before include "Spirit of a culture/age" , "Spirit (of an age/culture)" , "moral code" , "Characteristic attitude" , "Typical culture or attitudes" .)

I've seen this clue in The Times.

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