Crossword puzzle clue "one starting a story back in my day say"

One starting a story "Back in my day ...," say

Starting a project ... and what the letters between the starting and ending pairs of letters in each starred answer are doing?

Energetically starting one's day

"Push 'em back! Push 'em back! Way back!"?

Instrument often used in a flashback...back...back...back... *camera pans up everything goes blurry

Back-to-back-to-back championships

Starting point of a story where the ending point is, I guess, you're wearing riches

"Say Say Say," say