Quick getaway (3)
I believe the answer is:
lam
'quick getaway' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lam that I've seen before include "Thump; leg it" , "Flee hastily" , "On this, you're in flight, especially from the police" , "Go on the - - , (US sl.)" , "Hit hard or repeatedly" .)