Crossword Genius

Shady type chary of having his rest disturbed (7)

Ross

I believe the answer is:

shyster

I'm a little stuck... Click here to teach me more about this clue!

'shady type' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'chary of having his rest disturbed' is the wordplay.
I cannot quite see how this works, but
'chary' could be 'shy' (I've seen this before) and 'shy' is found in the answer.
an anagram of 'rest' is 'ster' which is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for shyster that I've seen before include "Dodgy dealer" , "Unethical man" , "One who acts unprofessionally- being bashful?" , "Lawyer using unethical methods" , "Suspect lawyer" .)

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