Smart, if I cease revealing cunning (8)
I believe the answer is:
artifice
'cunning' is the definition.
(thesaurus)
'smart if i cease revealing' is the wordplay.
'revealing' indicates the answer is hidden within the clue.
'ARTIFICE' is hidden within 'smart if i cease'.
(Other definitions for artifice that I've seen before include "BRICK/TRICK" , "Subtle deception" , "Race it if (anag) - cunning" , "Clever trick intended to mislead" , "Contrivance, trickery" .)