Silver seal going astray in French palace (10)
I believe the answer is:
versailles
'french palace' is the definition.
(I've seen this before)
'silver seal going astray' is the wordplay.
'going astray' indicates an anagram.
'silver'+'seal'='silverseal'
'silverseal' anagrammed gives 'VERSAILLES'.
'in' acts as a link.
(Other definitions for versailles that I've seen before include "French palace" , "Royal Court" , "Palace built by Louis XIV" , "Louis XIV's palace; WW one treaty" , "Palace near Paris" .)