Criticism of missing copy (5)
I believe the answer is:
repro
'copy' is the definition.
(I've seen this before)
'criticism of missing' is the wordplay.
'criticism' becomes 'reproof' (I've seen this before).
'missing' indicates named letters should be taken away.
'reproof' with 'of' taken out is 'REPRO'.
(Other definitions for repro that I've seen before include "Copy; copying" , "unoriginal style of furniture" , "Copying (of a document)" , "piece of furniture?" , "Roper (anag.)" .)