Token (7)
'token' is the definition.
(both can mean a ticket carrying a discount)
This is all the clue.
(Other definitions for voucher that I've seen before include "Coupon; receipt" , "Paper token" , "Something that can be exchanged for goods or services" , "Document that serves as evidence of some expenditure" , "Coupon that can be redeemed" .)
'token' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for symptom that I've seen before include "Evidence for disease" , "Sign of illness" , "Indicator of disease" , "Sign of disease" , "Indication (of disease, problem)" .)