Communicators on the rise aim to captivate English Duke (5)
I believe the answer is:
media
'communicators' is the definition.
(communication mediums)
'the rise aim to captivate english duke' is the wordplay.
'the rise' is a reversal indicator.
'to captivate' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'duke' becomes 'd' (abbreviation).
'aim' back-to-front is 'mia'.
'e'+'d'='ed'
'mia' placed around 'ed' is 'MEDIA'.
'on' acts as a link.
(Other definitions for media that I've seen before include "Press, TV etc" , "Purveyors of information to the public - I made them" , "TV, radio, papers, etc" , "The 14, for example" , "reporting channels" .)