Cleopatra's milk supplier? (5)
I believe the answer is:
mummy
I believe this clue is a double definition.
'cleopatra's' is the first definition.
(Cleopatra may have been mummified)
'milk supplier?' is the second definition.
(a mother may supply breast milk)
(Other definitions for mummy that I've seen before include "Parent - Egyptian corpse" , "Embalmed body of Pharaoh" , "Preserved Egyptian" , "one kept under wraps" , "Mother, informally" .)