Crossword Genius

Source of crude painting, in all likelihood (3,4)

Ross

I believe the answer is:

oil well

I'm a little stuck... Click here to teach me more about this clue!

'source of crude' is the definition.
(I've seen this before)

'painting in all likelihood' is the wordplay.
'painting' becomes 'oil' (oil painting is a kind of painting).
'in all likelihood' becomes 'well' (I am not sure about this - if you are sure you should believe this answer much more).
'oil'+'well'='OIL-WELL'

Can you help me to learn more?

(Other definitions for oil well that I've seen before include "Boring made for extracting petroleum" , "as result of a strike" , "How to minimise friction" , "crude container" , "Shaft beneath a nodding donkey?" .)

I've seen this clue in The Times.
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