Coarse cotton fabric (5)
'coarse cotton fabric' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for denim that I've seen before include "Coarse durable twill-weave cotton fabric" , "Mined (anag)" , "Hard-wearing cloth" , "Tough cotton fabric" , "Cloth for jeans, etc" .)
'coarse cotton fabric' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for chino that I've seen before include "Cotton twill fabric" , "strong cloth" , "Type of fabric" , "Twilled cotton cloth" , "Coarse twilled cotton fabric" .)