Dominant individual (3,3)

I think it could be either:

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3,3

top dog

'dominant individual' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for top dog that I've seen before include "Leader of a group" , "big cheese?" , "One pre-eminent in their field" , "Boss" , "Thirteen [HONCO]" .)

I've seen this clue in The Guardian.

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