Maestro to change cabin (9)
I believe the answer is:
stateroom
'cabin' is the definition.
(I have seen 'Private cabin' mean 'stateroom' so perhaps 'cabin' could also mean 'stateroom')
'maestro to change' is the wordplay.
'change' indicates an anagram.
'maestro'+'to'='maestroto'
'maestroto' is an anagram of 'STATEROOM'.
(Other definitions for stateroom that I've seen before include "luxurious cabin" , "Passengers's private compartment on ship" , "Luxury cabin on a liner" , "Place fit for a 27 [PRINCE]" , "part of palace" .)