Crossword Genius

Moulded terse version of Caesar's Rubicon speech? (3-4)

Ross

I believe the answer is:

die-cast

'moulded' is the definition.
(die-casting is a process of moulding metal)

I cannot understand how the rest of the clue works.

(Another definition for die-cast that I've seen is " from The Matrix?".)

I've seen this clue in The Guardian.
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