Fuel from bogs (4)
I believe the answer is:
peat
'fuel from bogs' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for peat that I've seen before include "Saturated and compressed vegetable matter, used as fuel when dried out" , "Bog material" , "Tape around turf" , "Some got energy from this" , "Tape (anag.)" .)