Threatened to change the decor (8)
I believe the answer is:
hectored
'threatened' is the definition.
(to hector someone is to threaten or bully them)
'change the decor' is the wordplay.
'change' indicates anagramming the letters.
'the'+'decor'='thedecor'
'thedecor' is an anagram of 'HECTORED'.
'to' is the link.
(Other definitions for hectored that I've seen before include "Bullied; blustered" , "Annoyed" , "Talked to bullyingly" , "Intimidated, bullied" .)