Crossword puzzle clue "little known dark"

Source of "Say! In the dark? Here in the dark! Would you, could you, in the dark?"

Little known — dark

"It builds strong bones, but who cares in this dark, dark world..."

Dark as dark can be

Dark purplish-brown to dark red

TV horror hostess known as "Mistress of the Dark"

Lesser-known older brother of Julia, who was featured in 2008's "The Dark Knight": 2 wds.

The ___ Formerly Known as Prince (how Prince was once known)