Crossword Genius

Mentality fixes established sets of beliefs (8)

Ross

I believe the answer is:

mindsets

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'mentality fixes' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'established sets of beliefs' is the wordplay.
I cannot quite understand how this works, but
'established' could be 'set' (set can mean established or agreed upon) and 'set' is located in the answer.
'beliefs' could be 'minds' (mind is a kind of belief) and 'minds' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

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I've seen this clue in The Irish Times.
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