Answer: stalactite

AnswerCrossword Clue
STALACTITE

Overhead projection?

STALACTITE

It may eventually form a column

STALACTITE

Cavern phenomenon.

STALACTITE
Cave sight.
STALACTITE
Hanging "icicle" in a cave
STALACTITEDrip source
STALACTITEHanging, of a sort
STALACTITEPoint at the ceiling? [misbehave]
STALACTITECave 'icicle'
STALACTITEIt may hang from a cave roof