Crossword Genius

Unrefined petroleum (5,3)

Ross

I believe the answer is:

crude oil

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unrefined petroleum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for crude oil that I've seen before include "liquid asset" , "that has boring producers?" , "Source of fuel" , "output from rig" , "From which petrol is made" .)

I've seen this clue in The Mirror, the LA Times and The Guardian.
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