Dodge goat crazed in ruthless competition (3-3-3)
I believe the answer is:
dog-eat-dog
'ruthless competition' is the definition.
(I've seen this before)
'dodge goat crazed' is the wordplay.
'crazed' indicates an anagram (a crazy order of the letters).
'dodge'+'goat'='dodgegoat'
'dodgegoat' with letters rearranged gives 'DOG-EAT-DOG'.
'in' is the link.
(Other definitions for dog-eat-dog that I've seen before include "Ruthless competition like canine cannibalism" , "Savage self concern" , "Ruthless competition of canine cannibals" , "Ruthless competition - self-interest" , "Ruthless competition as by cannibalistic canines" .)