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Traders here swapping cattle for sheep? (5,8)

Ross

I believe the answer is:

stock exchange

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'traders here swapping' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'cattle for sheep?' is the wordplay.
'cattle' becomes 'stock' (I've seen this before).
'for sheep?' becomes 'exchange' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stock'+'exchange'='STOCK EXCHANGE'

Can you help me to learn more?

(Other definitions for stock exchange that I've seen before include "City trading establishment" , "Nasdaq, for example" , "Securities market" , "Regulated market for securites" .)

I've seen this clue in The Times.
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