Crossword Genius

He fetches a dog (9)

Ross

I believe the answer is:

retriever

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for retriever that I've seen before include "Dog bred to fetch game" , "Breed of dog" , "making a complete recovery?" , "Hound" , "someone to set the situation right?" .)

I've seen this clue in The Mirror.
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