Petroleum’s old name (7)

I believe the answer is:

naphtha

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

I've seen this clue in The Sunday Times.

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