Duration of Xmas pantomime (4)

I believe the answer is:

span

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'duration' is the definition.
(I know that span is a type of duration)

I don't understand the remainder of the clue.

(Other definitions for span that I've seen before include "Complete duration" , "Measurement taken from an extended hand" , "Width of pans" , "Team of two matched oxen" , "Bridge made of pans" .)

I've seen this clue in The Sun.

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