Visual manifestation of something abstract (6)
I believe the answer is:
avatar
'visual manifestation of something abstract' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for avatar that I've seen before include "A person who seems to embody a particular ideal" , "Manifestation of a deity (Hinduism)" , "In Hinduism, the descent to earth of a deity" , "Internet ID icon" , "Human or animal manifestation of Vishnu" .)