Coercion used - group of police required (5)

I believe the answer is:

force

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

I cannot understand how the remainder of the clue works.

(Other definitions for force that I've seen before include "Might" , "Urge" , "Powerful effect or influence" , "Physical coercion" , "'Compel, pressurise (5)'" .)

I've seen this clue in The Irish News.

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