"A Boy Named Sue" singer (4)
I believe the answer is:
cash
'a boy named sue singer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cash that I've seen before include "Singer Johnny, d. 2003" , "Brass" , "Ready money" , ""Readies"" , "Spondulicks" .)