Foreign noble at a fine high-class French palace (13)
I believe the answer is:
fontainebleau
'french palace' is the definition.
(palace in France)
'foreign noble at a fine high-class' is the wordplay.
'foreign' indicates an anagram (foreign order of the letters).
'high class' becomes 'u'.
'noble'+'at'+'a'+'fine'='nobleatafine'
'nobleatafine' is an anagram of 'fontaineblea'.
'fontaineblea'+'u'='FONTAINEBLEAU'
(Other definitions for fontainebleau that I've seen before include "Town with chateau near Paris" , "French forest" , "French town" .)