Crossword Genius

Cleaner fluid into outlying grate (7)

Ross

I believe the answer is:

janitor

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'cleaner' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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

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