Quiet old politician in ceremony (4)
I believe the answer is:
pomp
'ceremony' is the definition.
(thesaurus)
'quiet old politician' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano').
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'politician' becomes 'mp'.
'p'+'o'+'mp'='POMP'
'in' is the link.
(Other definitions for pomp that I've seen before include "Splendid ceremonial" , "Grandiosity" , "Ceremonial elegance and splendour" , "Great show" , "Ceremonial display" .)