Nurse in room at Ronaldsay (6)
I believe the answer is:
matron
'nurse' is the definition.
(matron is a kind of nurse)
'in room at ronaldsay' is the wordplay.
'in' says the answer is hidden in the clue.
'MATRON' can be found hidden inside 'room at ronaldsay'.
(Other definitions for matron that I've seen before include "Head of nursing" , "Medical supervisor" , "Nurses' manager" , "Old woman" , "Former title of today's Senior Nursing Officer" .)