Change in clue, too, in manner of speaking (9)
I believe the answer is:
elocution
'manner of speaking' is the definition.
(elocution is a kind of manner of speaking)
'change in clue too' is the wordplay.
'change' is an anagram indicator.
'in'+'clue'+'too'='incluetoo'
'incluetoo' anagrammed gives 'ELOCUTION'.
'in' acts as a link.
(Other definitions for elocution that I've seen before include "first class phrasing?" , "Pronunciation" , "Art of clear speech" , "Entice Lou into art of speaking expressively" , "The skill of clear and expressive speech" .)