The orator’s undoing? (4,6)
I believe the answer is:
sore throat
'the orator's undoing?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'the orator's undoing?' is the wordplay.
'undoing?' indicates anagramming the letters.
'the'+'orators'='theorators'
'theorators' is an anagram of 'SORE THROAT'.
Can you help me to learn more?
(Another definition for sore throat that I've seen is " Inflammation affecting speech".)