Crossword Genius

Fast partner possibly hopping mad (7)

Ross

I believe the answer is:

furious

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'hopping mad' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for furious that I've seen before include "Extremely angry" , "Livid" , "Seeing red" , "at boiling point" , "how creditor feels?" .)

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