Man-made or plastic notes (9)
I believe the answer is:
memoranda
'notes' is the definition.
(memorandum is a kind of note)
'man-made or plastic' is the wordplay.
'plastic' indicates anagramming the letters (plastic can mean easily moulded).
'man'+'made'+'or'='manmadeor'
'manmadeor' with letters rearranged gives 'MEMORANDA'.
(Other definitions for memoranda that I've seen before include "official minutes" , "Communications" , "Notes recorded for future use" , "Records" , "Written messages or notes" .)