Crossword Genius

Fastidious janitor (9)

Ross

I believe the answer is:

caretaker

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

I cannot understand how the remainder of the clue works.

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(Other definitions for caretaker that I've seen before include "School worker, perhaps" , "Temporarily in charge" , "One looking after a building" , "Warden" , "exercising temporary control" .)

I've seen this clue in The Daily Express.
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