Nonsense coming from motorist having stopped short and left (6)
I believe the answer is:
drivel
'nonsense' is the definition.
(I've seen this before)
'motorist having stopped short and left' is the wordplay.
'motorist' becomes 'driver' (I've seen this before).
'having stopped short' means to remove the last letter.
'and' is a charade indicator (letters next to each other).
'left' becomes 'L' (common abbreviation).
'driver' with its final letter taken off is 'drive'.
'drive'+'l'='DRIVEL'
'coming from' is the link.
(Other definitions for drivel that I've seen before include "Stuff and nonsense" , "Worthless, foolish nonsense" , "Silly talk, twaddle" , "Slaver" , "Worthless talk" .)