A dull business redirected Irish police (5)

I believe the answer is:

garda

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'irish police' is the definition.
(member of the Irish police)

I cannot understand how the remainder of the clue works.

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(Other definitions for garda that I've seen before include "Italian lake - Irish policeman" , "Irish police officer" , "Irish state police force" , "Italian lake - Irish police" , "An Irish limb of the law" .)

I've seen this clue in The Independent.

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