Crossword Genius

Heading off rats, bull (5)

Ross

I believe the answer is:

hooey

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'bull' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for hooey that I've seen before include "rubbish" , "Codswallop" , "Balderdash" , "Nonsense (sl.)" .)

I've seen this clue in The Guardian.
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