Crossword Genius

A pet you'll lose nothing by having (9)

Ross

I believe the answer is:

retriever

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'a pet' is the definition.
(I've seen this before)

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 that fetches for its master" , "He brings back" , "Large gun-dog" , "Breed of dog" , "Working dog" .)

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