Crossword puzzle clue "back to square"

"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

Square part of a square meal?

___ Square (Times Square, once)

Square, in old slang, as indicated by forming a square with one's hands

Washington Square Park to Union Square Park dir.

Number whose square equals its square root