Crossword Genius

Judge rarebit harshly (7)

Ross

I believe the answer is:

arbiter

I'm a little stuck... Click here to teach me more about this clue!

'judge' is the definition.
(I know that arbiter is a type of judge)

'rarebit harshly' is the wordplay.
'rarebit' anagrams to 'ARBITER'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for arbiter that I've seen before include "Judge to decide a disputed issue" , "Referee or judge of rarebit" , "Someone with the power to settle the matter" , "One decides in disputes" , "Judge, umpire" .)

I've seen this clue in The Sun.
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