Crossword Genius

Delinquent off colour? (5)

Ross

I believe the answer is:

crook

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

This clue might be a double definition.

'delinquent' is the first definition.
(thesaurus)

'colour?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'off' is the link.

Can you help me to learn more?

(Other definitions for crook that I've seen before include "Shepherd's staff" , "Fence, perhaps" , "Bend; criminal; staff" , "Professional criminal" , "Something kinky" .)

I've seen this clue in the Sydney Morning Herald.
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