Crossword Genius

Imprisonment having stolen university gown (5)

Ross

I believe the answer is:

dress

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'gown' is the definition.
(gown is a kind of dress)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for dress that I've seen before include "changing gear" , "Straighten the line" , "clean > bandage" , "To prepare" , "Cultivate < tidy" .)

I've seen this clue in The Independent.
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