Crossword Genius

Carbon-rich bog deposit (4)

Ross

I believe the answer is:

peat

(Other definitions for peat that I've seen before include "It's used for fuel and in the garden" , "Vegetable matter in bogs, like turf" , "Turf as in bogland" , "Fuel from bogs" , "Partially carbonised vegetable matter used as a fuel when dried" .)

I've seen this clue in The Times.
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