Crossword Genius

Immoral fellow one's seen at the roulette table (4)

Ross

I believe the answer is:

rake

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'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" .)

I've seen this clue in The Independent.
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