Crossword Genius

Wherein high living is apt to be cheap (5)

Ross

I believe the answer is:

attic

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'wherein high' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
I also know that 'high' relates to this answer.

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

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(Other definitions for attic that I've seen before include "Top chamber" , "where high-ups are found?" , "28 [GREEK]" , "Upstairs room" , "top-flight accommodation" .)

I've seen this clue in the Evening Standard.
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