Crossword Genius

Collaborator with McCoist? (4)

Ross

I believe the answer is:

ally

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'collaborator' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for ally that I've seen before include "Co-operating person or nation" , "Friend and colleague" , "Band together" , "often helpful when cluing adverbs" , "Crony" .)

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