Personification of the sun, in myth (3)
I believe the answer is:
sol
'personification of the sun in myth' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sol that I've seen before include "Mexican lager" , "nearby star" , "Fifth note of scale" , "Roman sun-god" , "Personification of the sun" .)