Doctor Arnold hides in state (5,6)
I believe the answer is:
rhode island
'state' is the definition.
(Rhode Island is an example)
'doctor arnold hides' is the wordplay.
'doctor' indicates anagramming the letters.
'arnold'+'hides'='arnoldhides'
'arnoldhides' anagrammed gives 'RHODE ISLAND'.
'in' acts as a link.
(Other definitions for rhode island that I've seen before include "US East coast state" , "The Ocean State, capital Providence" , "One of the original 13 US states" , "New England state" , "Smallest state of the USA" .)