Crossword Genius

Important person (3,3)

Ross

'important person' is the definition.
(informal term for a boss or leader)

This is all the clue.

(Other definitions for top dog that I've seen before include "Member of learned society" , "Thirteen [HONCO]" , "big cheese?" , "one who's most successful" , "The master or victor in canine analogy" .)

I've seen this clue in the Evening Standard.
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