Mike —, private eye in novels by Mickey Spillane, such as I, the Jury and My Gun Is Quick (6)
I believe the answer is:
hammer
(Other definitions for hammer that I've seen before include "It's applied to a nail" , "Beetle" , "Go at it . . . . . . and tongs, with great energy and noise" , "Tool - trounce" , "Piano string striker; tool" .)