"Moonlight" actor Mahershala (3)
I believe the answer is:
ali
'moonlight actor mahershala' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ali that I've seen before include "Mohammad . . ., . . . Hewson" , "Muhammad's son-in-law" , "Muhammad ___ (or MacGraw?)" , "Dickens novel" , "Lepidopterous floater, apian stinger, d. 2016" .)