Good-for-nothing (8)
(Other definitions for deadbeat that I've seen before include "lazy so-and-so" , "Exhausted - layabout" , "Lazy, useless person" , "idle so-and-so" , "Vagrant's" .)
'good-for-nothing' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for wastrel that I've seen before include "Profligate" , "Spendthrift" , "Good-for-nothing person" , "Useless person" , "Ne'er-do-well" .)
'good-for-nothing' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for worthless that I've seen before include "Having no value" , "Wretched" , "Good-for-nothing" .)