Shoe feature that's conforming (6)

I believe the answer is:

instep

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'shoe' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for instep that I've seen before include "downtrodden area" , "Foot arch - conforming" , "Part of foot/shoe" , "Marching together correctly" , "Central part of a foot" .)

I've seen this clue in The Mirror.

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