Underworld boss carts off Croesus and his mates (10)

I believe the answer is:

plutocrats

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'croesus and his mates' is the definition.
The definition suggests a singular noun but the answer is a plural noun.

'underworld boss carts off' is the wordplay.
'underworld boss' becomes 'pluto' (Roman god of the underworld).
'off' is an anagram indicator.
'carts' with letters rearranged gives 'crats'.
'pluto'+'crats'='PLUTOCRATS'

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

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