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Quick incursion by the police to arrest first of perpetrators (5)

Ross

I believe the answer is:

rapid

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'quick' is the definition.
(synonyms)

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(Other definitions for rapid that I've seen before include "Electrical connector" , "Speedy (5)" , "Moving at speed" , "Prompt" , "Fast, speedy" .)

I've seen this clue in The Guardian.
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