Crossword Genius

Notable person I'm irritated to back (4)

Ross

I believe the answer is:

star

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'notable' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for star that I've seen before include "Brilliant person" , "Distant sun" , "Pointed symbol" , "White blaze on a horse's forehead" , "appear above others?" .)

I've seen this clue in The Telegraph.
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