Pair of horny males in coarse material (7)
I believe the answer is:
buckram
'coarse material' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for buckram that I've seen before include "Coarse cotton fabric stiffened with glue" , "Stiffened open-weave fabric" , "Coarse stuff" , "stiff stuff!" , "Bookbinding material - cub mark (anag)" .)