Say Kerry's busy? (5)

I believe the answer is:

garda

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'say' is the definition.
Both the answer and definition are singular nouns.
Maybe you can see a link between them that I don't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Sun.

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