Portable stove fuel (6)
(Other definitions for butane that I've seen before include "Flammable gas in petroleum" , "Bottled gas used as a fuel" , "Lighter fuel" , "Inflammable gas produced from petrol" .)
(Other definitions for kerosene that I've seen before include "No seeker for American fuel oil" , "Combustible" , "Sore knee (anag.)" , "Oil used as fuel in lamps and heaters" , "Paraffin oil (E, not I)" .)