". . . ___ with his own petard": Hamlet (5)
I believe the answer is:
hoist
(Other definitions for hoist that I've seen before include "group of flags" , "Raise on pulleys" , "elevator" , "Heave upwards" , "Lift up; device for this" .)
I believe the answer is:
hoist
(Other definitions for hoist that I've seen before include "group of flags" , "Raise on pulleys" , "elevator" , "Heave upwards" , "Lift up; device for this" .)