Crossword Genius

Command given to setter perhaps? (4)

Ross

I believe the answer is:

heel

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'command' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for heel that I've seen before include "Untrustworthy person" , "Shoe part - come here, Fido!" , "despicable person" , "secure ball" , "Slang scoundrel or rear of foot" .)

I've seen this clue in The Sun.
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