First to give one’s approval to (7)

I believe the answer is:

initial

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

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

(Other definitions for initial that I've seen before include "Relating to the beginning" , "Let; rent" , "Occurring at the beginning" , "E in Eileen" , "First letter (of a word)" .)

I've seen this clue in the Evening Standard.

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