Crossword Genius

Run away from lovely Mickey Mouse (5)

Ross

I believe the answer is:

petty

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'mickey mouse' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for petty that I've seen before include "Small-time" , "Trifling" , "Trivial - small-minded" , "small" , "Insignificant or trivial" .)

I've seen this clue in The Guardian.
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