Voucher scam taking in publisher (6)
I believe the answer is:
coupon
'voucher' is the definition.
(I've seen this before)
'scam taking in publisher' is the wordplay.
'scam' becomes 'con' (I've seen this before).
'taking in' indicates putting letters inside.
'publisher' becomes 'oup' (abbreviation for Oxford University Press).
'con' going around 'oup' is 'COUPON'.
(Other definitions for coupon that I've seen before include "betting slip" , "means to buy goods" , "Entry form" , "Token" , "Voucher or ticket" .)