Bog product (4)
I believe the answer is:
peat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bog product</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for peat that I've seen before include "Some got energy from this" , "Fuel cut from bog" , "Partially carbonised vegetable matter used as a fuel when dried" , "Fuel from bogs" , "Fuel from boggy land" .)