Crossword Genius

Court finally sent away unscrupulous opportunist (7)

Ross

I believe the answer is:

chancer

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'unscrupulous opportunist' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for chancer that I've seen before include "Informally, one who tries his luck" , "Unscrupulous sort" , "opportunistic sort" , "One taking risks" , "Unscrupulous opportunist" .)

I've seen this clue in The Telegraph.
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