Crossword Genius

What a dog might do for a cad (4)

Ross

I believe the answer is:

heel

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

'for a cad' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for heel that I've seen before include "Back part of the foot" , "Command to a trained dog" , "Come here, Rover!" , "Hindu loincloth" , "Untrustworthy person" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.