25/26 across
Top
director,
top
tester
and
theatre’s
top
checker
(6,6)
Top director, top tester and theatre’s top checker (6,6)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition here is Top director, pointing us to a famous filmmaker. A ROBER is someone in charge of robes, making them a "top tester," then T is the first (top) letter of "Theatre," and REINER means "checker" since to rein is to check — put them all together and you've got your answer.