A study of city (4)

I believe the answer is:

aden

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'city' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'a study' is the wordplay.
'study' becomes 'den' (term for a study or office).
'a'+'den'='ADEN'

'of' is the link.

Can you help me to learn more?

(Other definitions for aden that I've seen before include "Port city of Yemen" , "Yemen's chief port" , "Dean is out in the Middle Eastern port" , "Yemeni port" , "somewhere on the Arabian peninsula" .)

I've seen this clue in The Mirror.

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