They're the many (4)

I believe the answer is:

them

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'they're' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'the many' is the wordplay.
'many' becomes 'm' (Roman numeral for a thousand).
'the'+'m'='THEM'

Can you help me to learn more?

(Other definitions for them that I've seen before include "Certainly not us, the other lot" , "Others" , "(To/from) those people" , "Those people (as object)" , "people objectively" .)

I've seen this clue in the Evening Standard.

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