Rock band's also touring large part of Australia (10)
I believe the answer is:
queensland
'part of australia' is the definition.
(state of Australia)
'rock band's also touring large' is the wordplay.
'rock band's' becomes 'Queen's' (British rock band).
'also' becomes 'and' (both can mean in addition).
'touring' means one lot of letters goes inside another (touring can mean going round).
'large' becomes 'L' (eg in clothes sizes).
'queens'+'and'='queensand'
'queensand' placed around 'l' is 'QUEENSLAND'.
(Other definitions for queensland that I've seen before include "part of Australia" , "Australian territory" , "Australian state" , "NE state of Australia" .)