Listener intruding on row is more obviously upset (7)
I believe the answer is:
tearier
'row is more obviously upset' is the definition.
I can't judge whether this definition defines the answer.
'listener intruding on' is the wordplay.
'listener' becomes 'ear' (body part which hears or listens).
'intruding' becomes 'tier' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' is an insertion indicator (as in clothing 'on' a person).
'ear' going inside 'tier' is 'TEARIER'.
Can you help me to learn more?
(Another definition for tearier that I've seen is " more emotional".)