"Who's Who" entry
I believe the answer is:
bio
'who's who entry' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bio that I've seen before include "Prefix or combining form meaning of living things" , "Prefix denoting life" , "Life story (abbr)" , "Prefix denotes life" , "brief history" .)