A very thin ne’er-do-well? (4)
I believe the answer is:
rake
'thin ne'er-do-well?' is the definition.
'rake' can be an answer for 'thin' (thesaurus). I am not sure about the 'ne'er-do-well?' bit.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rake that I've seen before include "Debauchee" , "Minutely search" , "One with teeth" , "set at an angle" , "Playboy" .)