Preset pad out where motorists nabbed (5,4)
I believe the answer is:
speed trap
'where motorists nabbed' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'preset pad out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'preset'+'pad'='presetpad'
'presetpad' with letters rearranged gives 'SPEED TRAP'.
Can you help me to learn more?
(Other definitions for speed trap that I've seen before include "hazard for travellers in haste?" , "inconvenience for boy racers?" , "Hazard for fast motorist" , "something drivers might avoid" , "curse of drivers?" .)