Director DeMille (5)
I believe the answer is:
'director demille' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cecil that I've seen before include ". . . . . Rhodes, . . . . . B. de Mille" , "Man's name" , "Messrs Rhodes and de Mille" , "Rhodes of Rhodesia" , "Marquis of Salisbury family name" .)