They need money to pursue their hobby (12)

I believe the answer is:

numismatists

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

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(Another definition for numismatists that I've seen is " Coin collectors".)

I've seen this clue in The Globe and Mail.

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