Emcee's amplifier (4)
I believe the answer is:
mike
'emcee's amplifier' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mike that I've seen before include "may need this to speak" , "Device for converting sound waves to an electronic signal (abbr)" , "M; man's name" , "Boy's name - November's predecessor" , "Code word for M" .)