Light carriage and lie in wait (4)
I believe the answer is:
trap
'light carriage' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for trap that I've seen before include "Control ball" , "Means of transport - sometimes sprung!" , "get in net" , "fault" , "Ambush" .)