Crossword Genius

Bog makeup (4)

Ross

I believe the answer is:

peat

(Other definitions for peat that I've seen before include "Saturated and compressed vegetable matter, used as fuel when dried out" , "Decomposed vegetable matter" , "Natural solid fuel" , "Turf as in bogland" , "Fuel or compost (but no longer to be used as such!)" .)

I've seen this clue in the LA Times.
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