Inner being (4)
'inner being' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for soul that I've seen before include "Psyche" , "Music genre; human spirit" , "Individual; type of music" , "Essence" , "Immortal spirit; music style" .)
(Other definitions for ego that I've seen before include "Morale" , "(Self-assertive) personality" , "Self-esteem, conceit" , "Inflated pride" , "Aspect of the personality" .)