Fforde who writes the "Thursday Next" mystery novels (6)

I believe the answer is:

jasper

(Other definitions for jasper that I've seen before include "hard matter" , "stone used by jewellers" , "Reddish-brown stone used in jewellery" , "Opaque reddish-brown semi-precious stone" , "A man" .)

I've seen this clue in the LA Times.

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