Crossword Genius

Understand there’s to be no declaration (4)

Ross

I believe the answer is:

know

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'understand' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for know that I've seen before include "Have awareness of" , "Articulated" , "Be sure of something" , "Ken" , "Recognise" .)

I've seen this clue in the Evening Standard.
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