Communicate compiler's role (6)
I believe the answer is:
impart
'communicate' is the definition.
(imparting is a kind of communicating)
'compiler's role' is the wordplay.
'compiler's' becomes 'I'm' ('I am' referring to the compiler of the crossword).
'role' becomes 'part' (eg a part or role in a film).
'im'+'part'='IMPART'
(Other definitions for impart that I've seen before include "Armpit (anag)" , "Communicate (info)" , "Give - convey" , "Give - tell" , "Convey information, make known" .)