Backseat driver lacking experience swallowed lies (5)
I believe the answer is:
tales
'lies' is the definition.
(I know this)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tales that I've seen before include "Relations" , "Stories, fables" , "They might be tall" , "Stories, perhaps tall ones" , "Lies" .)