Fabulously rich leaders' stuff (6)

I believe the answer is:

fabric

I'm a little stuck... Click here to teach me more about this clue!

'stuff' is the definition.
(I know that fabric is a type of material)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for fabric that I've seen before include "Underlying structure" , "Perhaps felt" , "Material; structure" , "Manufactured cloth" , "Building structure; textile" .)

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

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