Lighter fuel (7)

I think it could be either:

Which length description are you looking for?:

butane

'lighter fuel' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for butane that I've seen before include "Inflammable gas produced from petrol" , "Bottled gas used as a fuel" , "Lighter fuel" , "Flammable gas in petroleum" .)

I've seen this clue in The Independent.

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