Immoral fellow one's seen at the roulette table (4)
I believe the answer is:
rake
'immoral fellow' is the definition.
'rake' can be an answer for 'fellow' (I have seen 'disreputable fellow' mean 'rake' so perhaps 'fellow' could also mean 'rake'). I am unsure of the 'immoral' bit.
I don't 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 "a string of railway wagons" , "Incline - libertine" , "Stage's sloping angle" , "Scrape" , "Garden tool - libertine" .)