Respect changes in royal staff (7)
I believe the answer is:
sceptre
'royal staff' is the definition.
(I've seen this before)
'respect changes' is the wordplay.
'changes' is an anagram indicator.
'respect' anagrammed gives 'SCEPTRE'.
'in' is the link.
(Other definitions for sceptre that I've seen before include "Royal staff (paired with 2 down)" , "Queen's staff" , "Part of the royal regalia" , "Rod of office" , "Respect (anag) -- symbol of ruler's authority" .)