Crossword Genius

Cunning leader removed from demo (4)

Ross

I believe the answer is:

arch

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'cunning' is the definition.
(I've seen this in other clues)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Inner part of foot" , "Self-consciously playful or teasing" , "Curved part of stone bridge, perhaps" , "Masonry construction for spanning an opening" , "Affectedly playful like curved structure" .)

I've seen this clue in The Sun.
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