Crossword Genius

City investment? (5)

Ross

I believe the answer is:

siege

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This clue might be a double definition.

'city' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'investment' is the second definition.
(investment can mean a siege)

Can you help me to learn more?

(Other definitions for siege that I've seen before include "Military operation to seal off (town)" , "Blockade of a town or fortress" , "Persistent attack" , "Military operation surrounding a town" , "seat" .)

I've seen this clue in The Globe and Mail.
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