Crossword Genius

City after six can be quite stimulating (4)

Ross

I believe the answer is:

agra

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'city' is the definition.
(Indian city)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for agra that I've seen before include "Indian masterpiece" , "Subcontinental city" , "Indian city, capital of the Mogul empire until 1658" , "mausoleum site" , "tourist centre" .)

I've seen this clue in The Irish Times.
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