Crossword Genius

In Charleston, for example, large room is used for ball (9)

Ross

I believe the answer is:

dancehall

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'used for ball' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'in charleston for example large room' is the wordplay.
'in' indicates putting letters inside.
'charleston for example' becomes 'dance' (charleston is a kind of dance).
'large' becomes 'L' (eg in clothes sizes).
'room' becomes 'hal' (I can't explain this - if you can you should give a lot more credence to this answer).
'dance'+'l'='dancel'
'dancel' enclosing 'hal' is 'DANCEHALL'.

'is' acts as a link.

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I've seen this clue in The Irish Times.
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