Crossword Genius

City’s spin over oil spill (7)

Ross

I believe the answer is:

tripoli

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'city's' is the definition.
(Tripoli is an example)

'spin over oil spill' is the wordplay.
'spin over' becomes 'trip' (I can't explain this - if you can you should believe this answer much more).
'spill' is an anagram indicator.
'oil' is an anagram of 'oli'.
'trip'+'oli'='TRIPOLI'

Can you help me to learn more?

(Other definitions for tripoli that I've seen before include "North African port" , "where there's been regime change" , "City in Libya - city in Lebanon" , "powdery deposit" , "Libyan port" .)

I've seen this clue in The Hindu.
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