Crossword Genius

Hole for extracting petroleum (3,4)

Ross

I believe the answer is:

oil well

(Other definitions for oil well that I've seen before include "How to minimise friction" , "Whence petroleum is extracted" , "Boring made for extracting petroleum" , "Source of crude" , "as result of a strike" .)

I've seen this clue in The Mirror and The Daily Mail.
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