Quiet around gold, solitary tomb (9)
I believe the answer is:
mausoleum
'tomb' is the definition.
(I know that mausoleum is a type of sepulcher)
'quiet around gold solitary' is the wordplay.
'quiet' becomes 'mum' (to keep mum is to stay quiet).
'around' means one lot of letters goes inside another.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'solitary' becomes 'sole' (synonym).
'au'+'sole'='ausole'
'mum' going around 'ausole' is 'MAUSOLEUM'.
(Other definitions for mausoleum that I've seen before include "Building with a tomb" , "Sepulchre" , "One may lie impressively in this" , "Great tomb - usual memo (anag)" , "Building for the dead" .)