Hearing viewer may be too upset with room (8)
I believe the answer is:
otoscope
'hearing viewer' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'too upset with room' is the wordplay.
'upset' is an anagram indicator.
'with' says to put letters next to each other.
'room' becomes 'scope' (as in scope or room for manoeuvre).
'too' anagrammed gives 'oto'.
'oto'+'scope'='OTOSCOPE'
'may be' is the link.
Can you help me to learn more?
(Other definitions for otoscope that I've seen before include "medical equipment" , "Instrument for visual examination of an ear" , "Lug instrument" , "probe" , "Device for looking in ears" .)