Summary of extra scene (8)

I believe the answer is:

overview

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'summary' is the definition.
(I know that overview is a type of summary)

I don't understand the remainder of the clue.

(Other definitions for overview that I've seen before include "General summary of a subject" , "inspection" , "Broad perspective formed from above, general survey" .)

I've seen this clue in The Telegraph and The Sun.

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