Wicked demo cut with new record (8)
I believe the answer is:
document
'record' is the definition.
(I know that document is a more specific form of record)
'wicked demo cut with new' is the wordplay.
'wicked' is an anagram indicator.
'with' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'demo'+'cut'='democut'
'democut' is an anagram of 'documet'.
'documet' enclosing 'n' is 'DOCUMENT'.
(Other definitions for document that I've seen before include "Paper, record" , "Paper, form" , "Official paper" , "Will, for example" , "Written record" .)