Stress, accentuation (8)
I believe the answer is:
emphasis
This clue is a double definition.
'stress' is the first definition.
(I know that stress can be written as emphasis)
'accentuation' is the second definition.
(synonyms)
(Other definitions for emphasis that I've seen before include "Force" , "Special importance or prominence given to something" , "Stress, accent" , "Intensity of expression" , "Accentutation" .)