Ten secrets about what actor may have to go through (6,4)
I believe the answer is:
screen test
'what actor may have to go through' is the definition.
'ten secrets about' is the wordplay.
'about' indicates an anagram.
'ten'+'secrets'='tensecrets'
'tensecrets' anagrammed gives 'SCREEN TEST'.
(Other definitions for screen test that I've seen before include "What might precede filming" , "in which player tries to impress" , "in which player is evaluated" , "trial for players" , "Audition of prospective actor" .)