Song; was untruthful (4)
I believe the answer is:
lied
I believe this is a double definition.
'song' is the first definition.
(type of German song)
'was untruthful' is the second definition.
(I've seen this in another clue)
(Other definitions for lied that I've seen before include "gave a false impression" , "Spoke falsely" , "Did not speak the truth" , "German air" , "German romantic recital piece" .)