Crossword Genius

Senior police officer, first-class (5)

Ross

I believe the answer is:

super

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'first-class' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for super that I've seen before include "First-rate, top-notch" , "Topnotch, terrific" , "Marvellous, terrific" , "Peerless" , "Great; wonderful" .)

I've seen this clue in The Times.
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