School truant in Everton, thus left side (5)

I believe the answer is:

verso

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'side' is the definition.
(I know that verso is a type of side)

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

(Other definitions for verso that I've seen before include "Left part of book" , "Left-hand page or back of a document" .)

I've seen this clue in The Guardian.

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