Crossword Genius

A very thin ne’er-do-well? (4)

Ross

I believe the answer is:

rake

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'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" .)

I've seen this clue in the Evening Standard.
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