Copy a couple of notes with chapter (5)
I believe the answer is:
mimic
'copy' is the definition.
(mimicking is a kind of copying)
'a couple of notes with chapter' is the wordplay.
'a couple of' shows that letters should be duplicated.
'notes' becomes 'mi' (**).
'with' means one lot of letters go next to another.
'chapter' becomes 'c'.
'mi' duplicated is 'mimi'.
'mimi'+'c'='MIMIC'
(Other definitions for mimic that I've seen before include "Impersonate" , "Imitate satirically" , "Copy (voice, mannerisms)" , "Imitate for humorous reasons" , "Impressionist" .)