Cotton fabric stiffened with glue, used in bookbinding (7)

I believe the answer is:

buckram

(Other definitions for buckram that I've seen before include "Cloth stiffened with size" , "Stiffened open-weave fabric" , "Bookbinding material - cub mark (anag)" , "used in bookbinding" , "Coarse material" .)

I've seen this clue in The Guardian.

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