Crossword Genius

Get one's back up? (4)

Ross

I believe the answer is:

rear

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'up?' is the definition.
(thesaurus)

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(Other definitions for rear that I've seen before include "Hitchcock film set in one room" , "Bring up - the tail" , "Bring up - back end" , "Rare at the back" , "Stern" .)

I've seen this clue in the Evening Standard.
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