Specific time you and I finally see man on board (9)

I believe the answer is:

weeknight

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But I can't explain it at all! Could you help me understand?

(Other definitions for weeknight that I've seen before include "Bit of time" , "Part of 67 [SENNIGHT]" , "Friday even, for example" , "End of working day" , "Saturday evening is not" .)

I've seen this clue in The Times.

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