Father of Phobos and Deimos (4)
I believe the answer is:
ares
'father of phobos and deimos' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ares that I've seen before include "Belligerent god" , "War-god" , "Olympian" , "figure of worship" , "Greek god of war" .)