Crossword Genius

What the rotter said to the dog? (4)

Ross

I believe the answer is:

heel

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'to the dog?' is the definition.
('heel' can be a synonym of 'dog')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for heel that I've seen before include "Hindu loincloth" , "See 21" , "As a dog, obey" , "swine" , "Call to dog" .)

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