Crossword Genius

Common party store purchase (8)

Ross

I believe the answer is:

balloons

(Other definitions for balloons that I've seen before include "Glasses are called for!" , "Inflatable party decorations" , "they give people a lift" , "Lighter-than-air aircraft run by hot air" , "Party novelties" .)

I've seen this clue in The New York Times.
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