Crossword Genius

Gave permission and reportedly went under, was ignored (10)

Ross

I believe the answer is:

sanctioned

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'gave permission' is the definition.

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

Can you help me to learn more?

(Other definitions for sanctioned that I've seen before include "Punished" , "officially allowed" .)

I've seen this clue in The Guardian.
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