Booby (4)
(Other definitions for trap that I've seen before include "Vehicle" , "Hook" , "Catch; two-wheeled carriage" , "Snare, ruse" , "Part of a snare" .)
'booby' is the definition.
(I know that booby can be written as dope)
This is the entire clue.
(Other definitions for dope that I've seen before include "Silly type" , "Sucker" , "Information; nitwit" , "Aircraft fabric varnish" , "The idiot's a drug" .)