Copied out of a cheap edition (4)
I believe the answer is:
aped
'copied' is the definition.
('ape' can be a synonym of 'copy')
'of a cheap edition' is the wordplay.
'of' indicates the answer is hidden within the clue.
'APED' is hidden within 'cheap edition'.
'out' acts as a link.
(Other definitions for aped that I've seen before include "Imitated in every aspect" , "Imitated, mimicked" , "Imitated like monkey" , "took off" , "Caricatured" .)