Clay-pigeon hurler (4)
I believe the answer is:
trap
'clay-pigeon hurler' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for trap that I've seen before include "Pitfall" , "Means of transport - sometimes sprung!" , "corner" , "Driver's obstacle" , "that may catch a speeding motorist" .)