Crossword puzzle clue "between h s t and j f k"

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