Crossword Genius

Where each August competitive sailors may be offensive (8)

Ross

I believe the answer is:

insolent

'be offensive' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

(Other definitions for insolent that I've seen before include "Cheeky" , "Impudent and disrespectful" , "Extremely fresh" , "Being discourteous and insulting" , "Pert" .)

I've seen this clue in The Guardian.
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