Style of enunciation (7)
I believe the answer is:
diction
'style of enunciation' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for diction that I've seen before include "Elocution" , "Way of speaking or pronouncing" , "Choice of words" , "Manner of enunciation" , "One's manner of speaking or pronouncing words" .)