Ken, say, being devious and cunning (6)
I believe the answer is:
sneaky
'cunning' is the definition.
(thesaurus)
'ken say being devious' is the wordplay.
'being devious' indicates anagramming the letters.
'ken'+'say'='kensay'
'kensay' with letters rearranged gives 'SNEAKY'.
'and' acts as a link.
(Other definitions for sneaky that I've seen before include "Sly and devious" , "Secretive and sly" , "Furtive, lacking candour" , "Cunning" , "Treacherous" .)