Crossword Genius

Someone pestering a dog (7)

Ross

I believe the answer is:

harrier

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'a dog' 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 harrier that I've seen before include "may get on your back?" , "that flies!" , "jump jet" , "Short-winged hawk" , "Bird - dog - plane" .)

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