I'm given a role to communicate (6)
I believe the answer is:
impart
'communicate' is the definition.
(impart can mean to communicate or pass on)
'i'm given a role' is the wordplay.
'given' means one lot of letters go next to another.
'a role' becomes 'part' (eg a part or role in a film).
'im'+'part'='IMPART'
'to' is the link.
(Other definitions for impart that I've seen before include "Give - tell" , "Pass on information" , "Convey information, make known" , "Communicate (information)" , "Pass on (knowledge, info)" .)