Says (6)
'says' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for utters that I've seen before include "Publishes" , "Gives vocal expression to" , "Speaks, articulates" , "Expresses audibly" , "Articulates, expresses" .)
(Other definitions for simon that I've seen before include "Fellow" , "Man's name" , "Peter (NT)" , "Simple chap" , "Simple pieman" .)