Crossword Genius

Somewhere to wait if the barn came apart (11)

Ross

I believe the answer is:

antechamber

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'somewhere to wait' is the definition.
I can't tell whether this definition defines the answer.

'the barn came apart' is the wordplay.
'apart' indicates anagramming the letters (the word is broken apart).
'the'+'barn'+'came'='thebarncame'
'thebarncame' anagrammed gives 'ANTECHAMBER'.

'if' is the link.

Can you help me to learn more?

(Other definitions for antechamber that I've seen before include "Small entrance room" , "Small room before a larger one" , "External room" , "room outside another" , "Waiting room" .)

I've seen this clue in the Sydney Morning Herald.
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