Palace of Versailles excursion not finishing soon (7)

I believe the answer is:

trianon

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'palace of versailles' is the definition.
The definition suggests a singular noun which matches the answer.

'excursion not finishing soon' is the wordplay.
'excursion' becomes 'trip' (a trip is an excursion or outing).
'not finishing' means to remove the last letter.
'soon' becomes 'anon' (synonyms).
'trip' with its last letter taken off is 'tri'.
'tri'+'anon'='TRIANON'

Can you help me to learn more?

(Other definitions for trianon that I've seen before include "Where agreement ended War" , "Grand and Petit Versailles villas" , "grand Palace of Versailles" , "Grand villa" , "The Grand - and Petit - are buildings at Versailles" .)

I've seen this clue in The Guardian.

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