Crossword Genius

Angry as a deserter? (5)

Ross

I believe the answer is:

ratty

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'angry' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for ratty that I've seen before include "water vole, literally" , "Characteristic of pest" , "Irritable, peevish" , "Wretched" , "Short" .)

I've seen this clue in The Sun.
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