Said "Terrible racket outside," with scorn (7)
I believe the answer is:
disdain
'scorn' is the definition.
(synonyms)
'said terrible racket outside' is the wordplay.
'terrible' indicates an anagram.
'racket' becomes 'din' (I've seen this before).
'outside' means one lot of letters goes inside another.
'said' with letters rearranged gives 'isda'.
'isda' put inside 'din' is 'DISDAIN'.
'with' acts as a link.
(Other definitions for disdain that I've seen before include "Haughtiness" , "Contumely" , "cold shoulder" , "Hauteur" , "'Contempt, condescension (7)'" .)