I object, return with quiet fury to this territory (6)
I believe the answer is:
empire
'this territory' is the definition.
(thesaurus)
'i object return with quiet fury' is the wordplay.
'i object' becomes 'me' ().
'return' says the letters should be written in reverse.
'with' says to put letters next to each other.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'fury' becomes 'ire' (ire is intense rage).
'me' backwards is 'em'.
'em'+'p'+'ire'='EMPIRE'
'to' is the link.
(Other definitions for empire that I've seen before include "Sovereign state" , "Jurisdiction" , "Number of countries ruled by one" , "Multinational" , "Several states ruled over by a single monarch" .)