Material that comes up when mined (5)

I believe the answer is:

denim

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

'material' is the definition.
(type of fabric)

'comes up when mined' is the wordplay.
'mined' can be anagrammed to 'DENIM'.
However, I am unsure how the anagram is indicated.

'that' acts as a link.

Can you help me to learn more?

(Other definitions for denim that I've seen before include "Hard-wearing material seen in jeans" , "Coloured cotton twill" , "Fabric used for jeans" , "Coarse durable twill-weave cotton fabric" , "dark blue material" .)

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