'Hound Dog' singer (5)
I believe the answer is:
elvis
'hound dog singer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elvis that I've seen before include "Singers Presley or Costello" , "Mr Presley" , "Performing artist once" , "Deceased king of rock 'n' roll" , "Singer Presley" .)