Answer:

hammer

Answer	Crossword Clue
HAMMER	Head hitter
HAMMER	Criticize severely
HAMMER	Word that can follow the ends of the answers to asterisked clues

HAMMER	It hits the nail on the head
HAMMER	Carpenter's tool
HAMMER	Framer's tool
HAMMER	Spillane's private eye
HAMMER	Track-and-field missile
HAMMER	Pound
HAMMER	Symbol on Soviet flag.
HAMMER	Red symbol.

HAMMER	Spillane's hero.
HAMMER	Drive.
HAMMER	Claw or sledge
HAMMER	Mallet
HAMMER	Thor's boomerang
HAMMER	U.S.S.R. symbol
HAMMER	Glockenspiel player's implement
HAMMER	Spillane Sleuth

HAMMER	Spillane protagonist
HAMMER	Spillane's "eye"
HAMMER	Tongs' partner
HAMMER	Kevel
HAMMER	"U Can't Touch This" rap singer
HAMMER	Ear's malleus, nonmedically
HAMMER	Soviet flag feature
HAMMER	Weapon for Thor