Those fools are all ordinary people (3,6)

I believe the answer is:

the masses

'all ordinary people' is the definition.

'those fools' is the wordplay.
'those' becomes 'them'.
'fools' becomes 'asses' (ass is a kind of fool).
'them'+'asses'='THE MASSES'

'are' is the link.

(Another definition for the masses that I've seen is " hoi polloi?".)

I've seen this clue in The Guardian.

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