Crossword puzzle clue "between xi and pi"

Yankees manager of the '70s between two Billy Martin stints and of the '80s between two Gene Michael stints

Words between "pie" and "mode," or "chicken" and "king": 2 wds.

"Human history becomes more and more ___ between education and catastrophe." (H.G. Wells)

Connery and Lazenby, between 1967 and 1971?

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

Actress and model who created a stir when she said nothing "comes between me and my Calvins" in an ad: 2 wds.

"Cradle it between your thumb and index finger," and the like?

Greek letter that comes between, and rhymes with, zeta and theta