Crossword Genius

Motorists won't be slow to fall into it (5,4)

Ross

I believe the answer is:

speed trap

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for speed trap that I've seen before include "something drivers might avoid" , "Hidden device" , "hazard for travellers in haste?" , "that slows motorist?" , "road safety measure" .)

I've seen this clue in The Globe and Mail.
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