Spirit of destiny overlooking one part of family (5)
I believe the answer is:
genus
'part of family' is the definition.
(biological taxonomy)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for genus that I've seen before include "Latin class?" , "Taxonomic group (biol.)" , "Kind or sort of" , "Class of animal" , "Biological group containing one or more species" .)