Plumed hat not quite right in formal dance (8)
I believe the answer is:
balmoral
'plumed hat' is the definition.
(balmoral is a type of hat)
'not quite right in formal dance' is the wordplay.
'not quite' means to remove the last letter.
'right' becomes 'moral' (similar in meaning).
'in' indicates putting letters inside.
'formal dance' becomes 'ball' (I've seen this in another clue).
'moral' with its final letter taken off is 'mora'.
'mora' placed into 'ball' is 'BALMORAL'.
(Other definitions for balmoral that I've seen before include "Royal residence - walking shoe - Scottish military hat" , "Royal family's holiday residence in Scotland" , "Bonnet" , "Laced boot" , "Royal castle in Scotland" .)