A frenetic, chaotic meeting (9)
I believe the answer is:
interface
'meeting' is the definition.
(point where two things meet)
'a frenetic chaotic' is the wordplay.
'chaotic' is an anagram indicator.
'a'+'frenetic'='afrenetic'
'afrenetic' anagrammed gives 'INTERFACE'.
(Other definitions for interface that I've seen before include "Boundary" , "Point where two thing meet" , "Windows, for example" , "meeting-point" , "Meeting point" .)