Without guile (7)
I believe the answer is:
'without guile' is the definition.
('guile' can be 'art' (I've seen this in another clue) so maybe 'without guile' can be ''artless')
This is the entire clue.
(Other definitions for artless that I've seen before include "Natural like slaters" , "Without pretension" , "Clumsy and uncaring" , "Nave" , "Ingenuous" .)