Superior room in old hospital unit (9)
I believe the answer is:
excellent
'superior' is the definition.
(similar in meaning)
'room in old hospital unit' is the wordplay.
I cannot quite understand how this works, but
'room' could be 'cell' (cell is a kind of room) and 'cell' is found in the answer.
'old' could be 'ex' (prefix meaning former or onetime) and 'ex' is located in the answer.
'unit' could be 't' (T is an example) and 't' is located in the answer.
The remaining letters 'en' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for excellent that I've seen before include "Really good, top class" , "First-class" , "'Superior, first class (9)'" , "Fine" , "magic" .)