Striking entails disruption (7)
I believe the answer is:
salient
'striking' is the definition.
(I know that striking can be written as salient)
'entails disruption' is the wordplay.
'disruption' is an anagram indicator.
'entails' with letters rearranged gives 'SALIENT'.
(Other definitions for salient that I've seen before include "Noteworthy" , "obvious" , "Leaping (heraldry)" , "Entails (anag) - most important" , "part of defences" .)