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Fit nut to source of oil (4-4)

Ross

I believe the answer is:

well-head

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'fit' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'nut to source of oil' is the wordplay.
'nut' becomes 'head' (nut can mean one's head).
'to' means one lot of letters go next to another (I've seen this in other clues).
'source of oil' becomes 'well' (oil well).
'head' put after 'well' is 'WELL-HEAD'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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