Good-for-nothing person (7)
I believe the answer is:
wastrel
'good-for-nothing person' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for wastrel that I've seen before include "Useless person" , "Prodigal" , "Spendthrift" , "A useless, good for nothing fellow" , "Ne'er-do-well" .)