I, for one, listened to declaration (6)

I believe the answer is:

avowal

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'to declaration' is the definition.
(avowal is a kind of declaration)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for avowal that I've seen before include "Open assertion" , "Positive declaration" , "Profession of" , "acknowledgement" , "Affirmation" .)

I've seen this clue in The Independent.

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