Crossword Genius

Speech-related examination includes a trio composition (9)

Ross

I believe the answer is:

oratorial

'speech-related' is the definition.
(oratory is public speaking)

'examination includes a trio composition' is the wordplay.
'examination' becomes 'oral' (oral is a kind of examination).
'includes' is an insertion indicator.
'composition' is an anagram indicator.
'a'+'trio'='atrio'
'atrio' is an anagram of 'toria'.
'oral' placed around 'toria' is 'ORATORIAL'.

(Another definition for oratorial that I've seen is " Well-spoken".)

I've seen this clue in The Guardian.
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