Repeated with fuel (4)
I believe the answer is:
peat
'fuel' is the definition.
(peat is a kind of fuel)
'repeated with' is the wordplay.
'with' indicates the answer is hidden within the clue.
'PEAT' is hidden in the letters of 'repeated'.
(Other definitions for peat that I've seen before include "Partially carbonised vegetable matter saturated with water" , "Saturated and compressed vegetable matter, used as fuel when dried out" , "Dried turf" , "Organic fuel" , "Turf as in bogland" .)