Crossword Genius

Like a march or an arch? (6)

Ross

I believe the answer is:

instep

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'an arch?' is the definition.
(I know that instep is a type of arch)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for instep that I've seen before include "Central part of a foot" , "Part of foot under spinet" , "Part of foot or shoe" , "Foot arch - conforming" , "Arch area of the foot" .)

I've seen this clue in The Independent.
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