Crossword Genius

Is inclined, when it's close to the master (5)

Ross

I believe the answer is:

heels

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'is' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for heels that I've seen before include "Dastardly types" , "Backs of the feet" , "Wedges" , "Foot parts" , "Cads - shoe parts" .)

I've seen this clue in the Evening Standard.
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