Philosopher on time for union collection (9)
I believe the answer is:
trousseau
'collection' is the definition.
(I've seen this before)
'philosopher on time for union' is the wordplay.
I cannot quite see how this works, but
'philosopher' could be 'rousseau' (Rousseau is an example) and 'rousseau' is found in the answer.
'time' could be 't' (abbreviation) and 't' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for trousseau that I've seen before include "Bridal accessories" , "train etc" , "old packet" , "Clothes collected by bride-to-be" , "Clothes, linens etc of a bride" .)