Speaks of total chaos at the back (6)

I believe the answer is:

utters

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'speaks' is the definition.
('utter' can be a synonym of 'speak')

I can't explain the remainder of the clue.

(Other definitions for utters that I've seen before include "Speaks, says" , "Articulates, expresses" , "Expresses audibly" , "Publishes" , "Speaks, articulates" .)

I've seen this clue in The Telegraph.

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