Crossword Genius

Start-of-year return for corrupt concierge (7)

Ross

I believe the answer is:

janitor

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

'concierge' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for janitor that I've seen before include "(In Scotland) school caretaker" , "One employed to clean and maintain a building" , "Caretaker or doorkeeper" , "Caretaker (mainly US)" , "Person looking after building" .)

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app