Hole for the extraction of petroleum (3,4)

I think it could be either:

Which length description are you looking for?:

3,4

oil well

(Other definitions for oil well that I've seen before include "Boring made for extracting petroleum" , "Whence petroleum is extracted" , "crude container" , "Source of petrol" , "not a source of 8 [RENEWABLE ENERGY]" .)

I've seen this clue in The Mirror.

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