Consider proviso notarised earlier, becoming discontented (6)

I believe the answer is:

ponder

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'consider' is the definition.
(I know that consider is a more specific form of the action ponder)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ponder that I've seen before include "Think weightily about" , "Contemplate, think over" , "Reflect" , "Consider deeply" , "Carefully consider" .)

I've seen this clue in The Irish Times.

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