Extremely competitive (3-3-3)

I believe the answer is:

dog-eat-dog

(Other definitions for dog-eat-dog that I've seen before include "Ruthless competition like canine cannibalism" , "Savagely ruthless" , "Ruthless pursuit of one's own interests" , "Internecine competition" , "Ruthless competition of canine cannibals" .)

I've seen this clue in the LA Times.

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