Tell them I am taking the role (6)
I believe the answer is:
impart
'tell' is the definition.
(imparting is a kind of telling)
'i am taking the role' is the wordplay.
'i am' becomes 'I'm'.
'taking' is a charade indicator (letters next to each other).
'the role' becomes 'part' (eg a part or role in a film).
'im'+'part'='IMPART'
'them' is the link.
This may not be correct. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for impart that I've seen before include "Communicate (information)" , "offer" , "Give, say information, make known" , "Pass on (knowledge, info)" , "Share, pass on" .)