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Holding unreasonable beliefs, a medley of merest mix (9)

Ross

I believe the answer is:

extremism

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'holding unreasonable beliefs a' is the definition.
I can't judge whether this defines the answer.

'medley of merest mix' is the wordplay.
'medley of' is an anagram indicator (I've seen 'medley' mean this).
'merest'+'mix'='merestmix'
'merestmix' is an anagram of 'EXTREMISM'.

Can you help me to learn more?

(Other definitions for extremism that I've seen before include "Ultra-radical views" , "The holding of way-out ideas" , "Radical political belief" , "The holding of far from moderate views" , "Immoderate political action" .)

I've seen this clue in The Sydney Morning Herald.
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