Like ham I repeatedly mixed with this corn (10)
I believe the answer is:
histrionic
'like ham' is the definition.
(a ham actor might be described as histrionic)
'i repeatedly mixed with this corn' is the wordplay.
'i repeatedly' can mean two replacements for 'i'.
'mixed with' indicates anagramming the letters.
'i'+'i'='ii'
'this'+'corn'='thiscorn'
'ii' mixed up with 'thiscorn' can make 'HISTRIONIC'.
(Other definitions for histrionic that I've seen before include "Overly theatrical" , "Of acting; dramatic" , "Melodramatic" .)