Fools common folks out of millions (5)
I believe the answer is:
asses
'fools' is the definition.
(ass can mean a foolish person)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for asses that I've seen before include "not the most sensible types" , "Fools; beasts of burden" , "Animals of horse family" , "Pompous fools" , "More than one fool" .)