Crossword Genius

Nodding donkey shaft (3,4)

Ross

I think it could be either:

Which length description are you looking for?:

7

3,4

oil well

(Other definitions for oil well that I've seen before include "Shaft found under a nodding donkey" , "Sunken source of fuel" , "Boring made for extracting petroleum" , "crude container" , "Source of crude" .)

I've seen this clue in The Guardian.
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