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Once party is over, they may have a deflated look? (8)

Ross

I believe the answer is:

balloons

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'they may have a deflated look?' is the definition.
The definition suggests an adverb but the answer is not.

'once party is over' is the wordplay.
'once' becomes 'oons' (I can't explain this - if you can you should give a lot more credence to this answer).
'party' becomes 'ball' (ball is a kind of party).
'is over' is a charade indicator (letters next to each other).
'oons' put after 'ball' is 'BALLOONS'.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.
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