Took care of it after Revenue reviewed something dishonourable (6)

I believe the answer is:

sordid

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'dishonourable' is the definition.
Both the definition and answer are adjectives. Perhaps you can see a link between them that I don't see?

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

Can you help me to learn more?

(Other definitions for sordid that I've seen before include "Dirty and unpleasant" , "Squalid, not honourable" , "Morally revolting" , "'Sleazy, squalid (6)'" , "Dirty, depressing and squalid" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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