Milk bars monopolise small brewer’s need (6,5)

I believe the answer is:

corner shops

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

'monopolise small brewer's need' is the wordplay.
'monopolise' becomes 'corner' (as in cornering the market).
'small' becomes 's' (abbreviation - e.g. clothes size).
'brewer's need' becomes 'hops' (I've seen this in another clue).
'corner'+'s'+'hops'='CORNER SHOPS'

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I've seen this clue in the Sydney Morning Herald.

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