Exceptional actress, really, but careless and without guile (9)

I believe the answer is:

artlessly

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

'without guile' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Another definition for artlessly that I've seen is " innocently".)

I've seen this clue in The Hindu.

Want a hint initially instead of a full solution? Install my app