Mistake over oil spilt in N African capital (7)

I believe the answer is:

tripoli

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'african capital' is the definition.
(capital of Libya)

'mistake over oil spilt in' is the wordplay.
'mistake over' becomes 'trip' (trip is a kind of mistake. I am not sure about the 'over' bit.).
'spilt' indicates an anagram.
'in' indicates putting letters inside.
'oil' with letters rearranged gives 'oli'.
'trip' placed within 'oli' is 'TRIPOLI'.

'n' acts as a link.

Can you help me to learn more?

(Other definitions for tripoli that I've seen before include "Libyan port" , "North African capital" , "city on the Mediterranean" , "Libyan capital" , "Capital of Libya" .)

I've seen this clue in The Times.

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