Where ales are brewed in Greater Manchester (4)

I believe the answer is:

sale

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'where ales are brewed in greater manchester' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'where ales' is the wordplay.
'where' indicates an anagram (I've seen this in other clues).
'ales' with letters rearranged gives 'SALE'.

Can you help me to learn more?

(Other definitions for sale that I've seen before include "Disposal of shop's stock at reduced prices" , "Period of low prices" , "Offer period" , "Occasion for buying at reduced prices" , "Bargain-price event" .)

I've seen this clue in the Evening Standard.

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