Cryptic crossword clue
Four adult films; perhaps Marlon Brando should get an agent 9

The most common and most likely answer to this crossword clue is the 9 letter word ACTIVATOR

A
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V
A
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Buddy explains!

The straight part
We know that "agent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case agent = activator.
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 ACTIVATOR mean?

ACTIVATOR noun
  1. One who, or that which, activates.
  2. Something that activates a catalyst
  3. Any chemical or agent which regulates one or more genes by increasing the rate of transcription.
  4. A type of effector that increases the rate of enzyme-mediated reactions.
  5. A type of dopant used in phosphors and scintillators.
  6. An agent that enables the flotation of a mineral or minerals.

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