Cunning anarchist hides (4)
I believe the answer is:
arch
'cunning' is the definition.
(I've seen this in other clues)
'anarchist hides' is the wordplay.
'hides' indicates a hidden word.
'ARCH' is hidden in the letters of 'anarchist'.
(Other definitions for arch that I've seen before include "Curved under-part of foot" , "Affectedly playful in curved manner" , "Clever" , "Knowing, sly" , "Cunning; principal" .)