Most overdue Hollywood audition (6)
I believe the answer is:
latest
'most overdue' is the definition.
('late' can be similar in meaning to 'overdue')
'hollywood audition' is the wordplay.
'hollywood' becomes 'LA' (Hollywood is a neighbourhood of Los Angeles).
'audition' becomes 'test' (I've seen this in another clue).
'la'+'test'='LATEST'
(Other definitions for latest that I've seen before include "Most recent or tardiest" , "Most recent, hot off the press" , "Up-to-the-minute" , "Stop press news?" , "Most recent (news)" .)