Unhappiness, note, in pop festival location? (10)
I believe the answer is:
discontent
'unhappiness' is the definition.
(discontent is a kind of unhappiness)
'note in pop festival location?' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'note' is 'onte' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for discontent that I've seen before include "Dissatisfaction" , "Bad feelings" , "blighted Gloucester's winter" , "'Now is the 16 of our _____ made 2 15 by this sun of 7'" , "Now is the winter of our - (Richard III)" .)