Spillane's Hammer (4)
I believe the answer is:
mike
'spillane's hammer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mike that I've seen before include "T [Thespian] Reid" , "letter in code" , "that helps speaker to be heard" , "Boy's name; piece of recording equipment" , "Man" .)