City green (7)

I believe the answer is:

lincoln

I believe this clue is a double definition.

'city' is the first definition.
(Lincoln is an English city)

'green' is the second definition.
(Lincoln green is a shade of green)

(Other definitions for lincoln that I've seen before include "The first green" , "US politician?" , "Type of green" , "City on River Witham" , "An assassinated US president" .)

I've seen this clue in The Guardian.

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