Announce that you’re not running? (7)

I believe the answer is:

declare

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'announce' is the definition.
('declare' can be a synonym of 'announce')

I cannot understand how the rest of the clue works.

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(Other definitions for declare that I've seen before include "Announce formally" , "Aver, state" , "Assert" , "Announce; end innings" , "Make a statement, to customs perhaps" .)

I've seen this clue in the Evening Standard.

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