Crossword Genius

Two beastly males providing stiff fabric (7)

Ross

I believe the answer is:

buckram

'stiff fabric' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for buckram that I've seen before include "Coarse stuff" , "Coarse stiffened cloth" , "Cloth stiffened with size" , "Coarse cotton fabric stiffened with glue" , "stiffening" .)

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