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Jolly rat eschews vile treachery (6)

Ross

I believe the answer is:

cheery

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'jolly' is the definition.
(thesaurus)

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(Other definitions for cheery that I've seen before include "Happy, optimistic" , "Bright - pleasant - good-humoured" , "Merry, jovial" , "Joyful -- optimistic" , "In good spirits" .)

I've seen this clue in the Sydney Morning Herald.
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