Crossword Genius

Study setter's material (5)

Ross

I believe the answer is:

denim

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

'study setter's' is the wordplay.
'study' becomes 'den' (term for a study or office).
'setter's' becomes 'im' (I am - referring to the crossword setter).
'den'+'im'='DENIM'

(Other definitions for denim that I've seen before include "Hard-wearing cloth" , "Mined (anag)" , "Twill cloth" , "Hard-wearing material seen in jeans" , "Twilled cotton fabric" .)

I've seen this clue in The Guardian.
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