No backing for forced change of government voucher (6)
I believe the answer is:
coupon
'government voucher' is the definition.
'coupon' can be an answer for 'voucher' (synonyms). I am not certain of the 'government' bit.
'no backing for forced change' is the wordplay.
'backing' is a reversal indicator.
'for' says to put letters next to each other (I've seen this in other clues).
'forced change' becomes 'coup' (I can't explain this - if you can you should give a lot more credence to this answer).
'no' reversed gives 'on'.
'on' after 'coup' is 'COUPON'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for coupon that I've seen before include "Voucher or ticket" , "Token" , "means to buy goods" , "betting slip" , "Entry form" .)