Rocky sent secret audition (6,4)
I believe the answer is:
screen test
'audition' is the definition.
(screen test is a kind of audition)
'rocky sent secret' is the wordplay.
'rocky' indicates anagramming the letters.
'sent'+'secret'='sentsecret'
'sentsecret' with letters rearranged gives 'SCREEN TEST'.
(Other definitions for screen test that I've seen before include "in which player is evaluated" , "trial for players" , "What might precede filming" , "Audition of prospective actor" , "in which player tries to impress" .)