Crossword Genius

He fetches a creature (9)

Ross

I believe the answer is:

retriever

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'he fetches' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'a creature' is the second definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for retriever that I've seen before include "Gun dog" , "Gun-dog, may be golden" , "Large gun-dog" , "Dog bred to fetch game" , "Working dog" .)

I've seen this clue in The Mirror.
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