Crossword Genius

No idle presence within Airedale region (4)

Ross

I believe the answer is:

area

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'region' is the definition.
(synonyms)

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

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(Other definitions for area that I've seen before include "environs" , "Region; extent of a surface" , "Field of activity or surface" , "field of study" , "District; locale" .)

I've seen this clue in The Telegraph.
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