Second moon of Ewoks safe after evacuation (7)

I believe the answer is:

endorse

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'second' is the definition.
(I know that second can be written as endorse)

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

Can you help me to learn more?

(Other definitions for endorse that I've seen before include "'Approve of, back (7)'" , "Put penalty points on (a driving licence)" , "Say you approve" , "Give support or approval to" , "Docket" .)

I've seen this clue in The Sun.

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