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Nan coughed terribly taking off old uniform (9)

Ross

I believe the answer is:

unchanged

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'uniform' is the definition.
(thesaurus)

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

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(Other definitions for unchanged that I've seen before include "Remaining in an original state" , "Not altered" , "Unaltered" .)

I've seen this clue in The Telegraph.
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