Possibly mined for material (5)

I believe the answer is:

denim

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

'possibly mined' is the wordplay.
'possibly' is an anagram indicator.
'mined' anagrammed gives 'DENIM'.

(Other definitions for denim that I've seen before include "Thick cotton cloth" , "Hard-wearing cotton fabric" , "Tough cotton fabric" , "Hard-wearing blue fabric" , "Hard-wearing cloth" .)

I've seen this clue in The Mirror.

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