The orator's planned delivery may be affected by this (4,6)

I believe the answer is:

sore throat

'delivery may be affected by this' is the definition.
(as in delivering speech)

'the orator's planned' is the wordplay.
'planned' is an anagram indicator.
'the'+'orators'='theorators'
'theorators' is an anagram of 'SORE THROAT'.

(Another definition for sore throat that I've seen is " Inflammation affecting speech".)

I've seen this clue in The Telegraph.

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