Where you might get blue shoe? (6)

I believe the answer is:

oxford

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'shoe?' is the definition.
(I know that oxford is a type of shoe)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for oxford that I've seen before include "Boat Race's Dark Blues" , "River in Newcastle" , "city producing different make" , "- Blue; - bags" , "English university town" .)

I've seen this clue in The Times.

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