Emphasis rude censor modified (10)
I believe the answer is:
underscore
'emphasis' is the definition.
'rude censor modified' is the wordplay.
'modified' is an anagram indicator.
'rude'+'censor'='rudecensor'
'rudecensor' with letters rearranged gives 'UNDERSCORE'.
(Other definitions for underscore that I've seen before include "19 ?" , "Emphasise" , "It's beneath character to highlight" , "Stress" .)