Soothing stuff said to be found in royal residence (8)
I believe the answer is:
balmoral
'royal residence' is the definition.
(I've seen this before)
'soothing stuff said' is the wordplay.
'soothing stuff' becomes 'balm' (I've seen this in another clue).
'said' becomes 'oral' (both can mean spoken).
'balm'+'oral'='BALMORAL'
'to be found in' is the link.
(Other definitions for balmoral that I've seen before include "Holiday residence in Scotland of British royal family" , "Scottish castle and royal residence" , "Royal castle in the Grampian" , "Royal castle in Scotland" , "Royal holiday residence on the River Dee" .)