Crossword Genius

Perhaps a setter to follow? (3)

Ross

I believe the answer is:

dog

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'to follow?' is the definition.
(dog can mean to follow or torment)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for dog that I've seen before include "A pet; its life prov. wretched" , "'Every ... is allowed one bite'" , "plague?" , "'You cannot teach an old ... new tricks'" , "Follow - canine" .)

I've seen this clue in The Times.
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