Symbol; voucher (5)
I believe the answer is:
token
This clue is a double definition.
'symbol' is the first definition.
(I know that token is a type of symbol)
'voucher' is the second definition.
(I've seen this before)
(Other definitions for token that I've seen before include "Privately issued coin or voucher" , "Keepsake or memorial as of friendship" , "Indication, symbol or voucher" , "Perfunctory" , "signal" .)