I follow Bert in line for a rake (9)
I believe the answer is:
libertine
'a rake' is the definition.
(thesaurus)
'i follow bert in line' is the wordplay.
'follow' is a charade indicator (letters next to each other).
'in' means one lot of letters goes inside another.
'i' after 'bert' is 'berti'.
'berti' put inside 'line' is 'LIBERTINE'.
'for' acts as a link.
(Other definitions for libertine that I've seen before include "Sensually indulgent person" , "of roues" , "Say, Don Giovanni" , "reprobate" , "Debauchee" .)