At the End of the Day

The meta answer is SLUMBER (Hint: Find a 7-letter verb). Seven answers in the grid start with three-letter abbreviations of the days of the week. They appear from left to right and top to bottom; here they are with their clues:

17A. Colorful arc seen in waterfalls: SUNBOW

18A: Significant structure: MONUMENT

23A. "You are mine," in Madrid: TUERESMIO

42A: Merger, of a sort : WEDLOCK

54A: It's pushed when posting: THUMBTACK

66A: Meow Mix alternative: FRISKIES

69A. Lustrous fabric: SATEEN

The name of the puzzle is "At the End of the Day." If you look at the first letter that comes immediately at "end" of each "day", you'll find the letters B-U-R-L-M-S-E, which anagram into SLUMBER, a 7-letter verb (which most folks do at the end of the day!) that satisfies the puzzle's hint.

Very enjoyable meta! Thanks, Cory!

Seven days without slumber makes one weak. Got it. Thanks, Cory!

Fun puzzle with a red herring that probably only constructors would have seen. You have seven words with K in them and as a constructor I (and every other one I am sure) knows that they are harder to put in a puzzle (thus the reason they score higher in Scrabble). When I saw 7 of them in a puzzle with a 7 letter verb as the answer I was SURE (also because one comes at the end of "LOCK" and another in a word with "OOK") that it had to do with a clock. It was when I started to try to parse out the words with the Ks that I saw FRISKIES and WEDLOCK and the realization of another 7 hit.

Didn't even have to use the anagram solver, almost solved it in my sleep!

Thanks Cory