Copy, somewhat inferior perhaps, on reflection (5)
I believe the answer is:
repro
'copy' is the definition.
(I've seen this before)
'somewhat inferior perhaps on reflection' is the wordplay.
'somewhat' indicates a hidden word.
'on reflection' is a reversal indicator.
'orper' can be found hidden inside 'inferior perhaps'.
'orper' written backwards gives 'REPRO'.
(Other definitions for repro that I've seen before include "Roper (anag.)" , "(Of furniture) a copy" , "Type of furniture" , "unoriginal style of furniture" , "Copying (of a document)" .)