Crossword Genius

One getting stuck in, centenary parties so expansive? (6-4)

Ross

I believe the answer is:

ninety-acre

I'm a little stuck... Click here to teach me more about this clue!

'one' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'getting stuck in centenary parties so expansive?' is the wordplay.
I cannot really understand how this works, but
'getting' could be 're' (I've seen this in other clues) and 're' is located in the answer.
'in' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Telegraph.
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