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Range over an area in a clean-up operation (5)

Ross

I believe the answer is:

scour

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'range over' is the definition.
(thesaurus)

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(Other definitions for scour that I've seen before include "purge" , "Turn upside down" , "Rub hard or search thoroughly" , "Clean by scrubbing" , "flush out" .)

I've seen this clue in The Globe and Mail.
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