Thomas William —, English agriculturist associated with the Holkham estate in Norfolk (4)

I believe the answer is:

coke

(Other definitions for coke that I've seen before include "Fuel made from coal" , "A solid fuel; a drug (abbr.)" , "Carbonised fuel residue" , "Residue from coal used as fuel" , "Solid fuel - drink - drug" .)

I've seen this clue in The Mirror.

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