Crossword Genius

What could make us calmer is a worldly notion (10)

Ross

I believe the answer is:

secularism

'a worldly notion' is the definition.

'what could make us calmer is' is the wordplay.
'what could make' indicates an anagram.
'us'+'calmer'+'is'='uscalmeris'
'uscalmeris' anagrammed gives 'SECULARISM'.

(Another definition for secularism that I've seen is " Belief in excluding religion from state functions".)

I've seen this clue in The Guardian.
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