Half of fabled riches made from this material (6)

I believe the answer is:

fabric

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'this material' is the definition.
(synonyms)

'half of fabled riches' is the wordplay.
'half of' means to take half the letters.
'riches' becomes 'ric' (I can't justify this - if you can you should give a lot more credence to this answer).
'fabled' cut in half is 'fab'.
'fab'+'ric'='FABRIC'

'made from' acts as a link.

Can you help me to learn more?

(Other definitions for fabric that I've seen before include "Underlying structure" , "Material in general" , "(Texture of) cloth" , "stuff" , "Building structure; textile" .)

I've seen this clue in The Irish Times.

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