Crossword Genius

First politician agitated cop missed (7)

Ross

I believe the answer is:

initial

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'first' is the definition.
(similar in meaning)

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

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(Other definitions for initial that I've seen before include "Primary" , "Original; beginning" , "Introductory" , "Letter - opening" , "Sign" .)

I've seen this clue in The Daily Express.
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