Crossword Genius

The smoke, perhaps, but not London (6)

Ross

I believe the answer is:

havana

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

'the smoke' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for havana that I've seen before include "Capital of Cuba" , "Smoke" , "island capital" , "Caribbean capital" , "city" .)

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