Tape off some fuel (4)
I believe the answer is:
peat
'some fuel' is the definition.
(peat is a kind of fuel)
'tape off' is the wordplay.
'off' indicates anagramming the letters.
'tape' with letters rearranged gives 'PEAT'.
(Other definitions for peat that I've seen before include "Decomposed vegetable matter" , "load of stuff in the garden?" , "Fuel dug from bog" , "Form of fuel" , "Dried plant material used as fuel" .)