Dissolute man in horse-drawn carriage blowing top (4)
I believe the answer is:
rake
'dissolute man' is the definition.
(I've seen this before)
'horse-drawn carriage blowing top' is the wordplay.
'horse-drawn carriage' becomes 'brake' (I've seen this before).
'blowing top' means to remove the first letter.
'brake' with its initial letter taken off is 'RAKE'.
'in' acts as a link.
(Other definitions for rake that I've seen before include "Dissipated type; garden implement" , "Inclination - dissolute man" , "Garden tool - libertine" , "Roue - garden tool" , "Smooth - Lothario" .)