Petroleum product used in lighter fluids (7)

I believe the answer is:

naphtha

(Other definitions for naphtha that I've seen before include "Flammable liquid hydrocarbon mixture" , "Flammable liquid used as solvent" , "Flammable oil from wood, coal tar, etc" , "Solvent ingredient" , "fiery mixture" .)

I've seen this clue in The Guardian.

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