Fuel from a bog (4)

I believe the answer is:
peat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fuel from a bog</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for peat that I've seen before include "Natural solid fuel" , "Vegetable matter in bogs, like turf" , "Organic fuel" , "Fuel from bogs" , "Turf as in bogland" .)