Means of communicating with some immediacy (5)
I believe the answer is:
media
'means of communicating' is the definition.
'with some immediacy' is the wordplay.
'with' indicates a hidden word.
'MEDIA' is hidden in the letters of 'some immediacy'.
(Other definitions for media that I've seen before include "Newspapers, TV, radio etc" , "TV, radio, papers, etc" , "Reporters" , "Press, TV etc" , "oils as examples" .)