Mystery Writers of America award (5)
I believe the answer is:
edgar
'mystery writers of america award' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for edgar that I've seen before include "- Rice Burroughs, US novelist" , ". . . . . Allan Poe, master of the macabre" , "King of England" , "- Wallace, Eng. thriller writer" , "J. -- Hoover, FBI boss" .)