Crossword Genius

A dog trained to fight (7)

Ross

I believe the answer is:

terrier

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'a dog' is the definition.
(terrier is a kind of dog)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for terrier that I've seen before include "One who volunteers to fight" , "(Yorkshire?) dog" , "Dog - army volunteer - land register" , "Breed of dog - volunteer soldier - estate register" , "Breed of dog - Territorial Army volunteer" .)

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