What impatient motorists may do is quite a laugh! (4)

I believe the answer is:

hoot

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'laugh' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for hoot that I've seen before include "Shout of derision" , "Sound of owl" , "Hollow cry" , "Owlish cry" , "what's voiced in parliament?" .)

I've seen this clue in the Evening Standard.

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