Some drama fellow misplaced in non-fiction (3)

I believe the answer is:

act

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'fiction' is the definition.
(I know that act is a type of dramatic composition)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for act that I've seen before include "Perform - part of a play" , "Exploit" , "Assumed attitude" , "Accomplishment" , "Written piece of legislation" .)

I've seen this clue in The Independent.

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