Wasn't truthful (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
lied
'wasn't truthful' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lied that I've seen before include "Spoke falsely" , "Made up a story" , "Told an untruth" , "Song in Berlin" , "Told stories" .)