Fuel gas (6)
'fuel gas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for butane that I've seen before include "Bottled gas used as a fuel" , "Flammable gas in petroleum" , "Lighter fuel" , "Inflammable gas produced from petrol" .)
'fuel gas' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for methane that I've seen before include "Flammable gas, CH4" , "Get fuel" , "contributor to global warming" , "Naturally occurring flammable gas" , "Marsh gas - the name (anag)" .)