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.