Crossword Genius

Our man's place in Graham Greene's work (6)

Ross

I believe the answer is:

havana

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

'work' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'our man's place in graham greene's' is the wordplay.
I cannot quite understand how this works, but
'man' could be 'van' and 'van' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for havana that I've seen before include "Cuban capital - cigar" , "city" , "Caribbean capital" , "island capital" , "Cuba's capital" .)

I've seen this clue in the Evening Standard.
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