Legend starts to chronicle elderly ladies endangering boys... (5)
I believe the answer is:
celeb
'legend' is the definition.
'starts to chronicle elderly ladies endangering boys' is the wordplay.
'starts to' suggests taking the first letters.
The initial letters of 'chronicle elderly ladies endangering boys' is 'CELEB'.
(Other definitions for celeb that I've seen before include "Famous person (sl.)" , "Famous person (colloq.)" , "Famous person (abbr)" , "popular star" , "Big name" .)