Crossword Genius

Cunning aspect of anarchosyndicalism (4)

Ross

I believe the answer is:

arch

I'm a little stuck... Click here to teach me more about this clue!

'cunning' is the definition.
(I've seen this in another clue)

'aspect of anarchosyndicalism' is the wordplay.
'ARCH' is hidden within the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Curved part of the foot" , "in short, is out of date" , "Curved form" , "Curve that spans an opening" , "one under a foot?" .)

I've seen this clue in The Everyman puzzle in The Observer.
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