Crossword Genius

The suburb for Parisians with flighty ideas? (4)

Ross

I believe the answer is:

orly

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'the suburb' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for orly that I've seen before include "French airport" , "Parisian airport" , "Paris airport" .)

I've seen this clue in the Evening Standard.
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