Relies on changes in a play's royal residence (8)
I believe the answer is:
elsinore
'a play's royal residence' is the definition.
I can't tell whether this definition defines the answer.
'relies on changes' is the wordplay.
'changes' indicates anagramming the letters.
'relies'+'on'='relieson'
'relieson' anagrammed gives 'ELSINORE'.
'in' is the link.
Can you help me to learn more?
(Other definitions for elsinore that I've seen before include "wicked behaviour played out here?" , "Danish city" , "Hamlet's place" , "Danish port, setting of Shakespeare's Hamlet" , "place in Hamlet" .)