Crossword Genius

Five lost from barge in Oxford? (4)

Ross

I believe the answer is:

shoe

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'oxford?' is the definition.
(oxford is a kind of shoe)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shoe that I've seen before include "Trainer maybe" , "Foot-covering" , "Last product" , "Rim of metal nailed to a horse's hoof" , "Foot cover" .)

I've seen this clue in The Telegraph.
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