Answer:

slinger

Answer	Crossword Clue
SLINGER	David's part in Goliath's fall.
SLINGER	David was one.
SLINGER	Missile man of ancient warfare.

SLINGER	Hash ....
SLINGER	Hash-... (counterman)
SLINGER	David in the valley of Elah
SLINGER	Mud thrower, say
SLINGER	Ending with gun or mud