Taiwan's top philosopher accumulated household items for union (9)
I believe the answer is:
Here is my best explanation:
'accumulated household items for union' is the definition.
'taiwan's top philosopher' is the subsidiary indication.
'taiwan's top' becomes 't' (I can't justify this - if you can you should give a lot more credence to this answer).
'philosopher' becomes 'rousseau' (Rousseau is an example).
(Other definitions for trousseau that I've seen before include "Bride's bottom drawer", "All that a bride needs!", "Collection for union", "old packet", "sign of future union", "Bridal accessories", "Items collected by a bride for her marriage", "Clothes collected for a purpose", "A bride's clothes collection" and "Bride's accoutrements".)