Cryptic crossword clue
Supporting De Niro cast with a set out in advance 10

The most common and most likely answer to this crossword clue is the 10 letter word FOREORDAIN

I've seen this crossword clue in The Guardian
F
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Buddy explains!

The straight part
We know that "set out in advance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set out in advance = foreordain.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FOREORDAIN mean?

FOREORDAIN verb
  1. To predestine or preordain.

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