Voucher given to fellow (5)
I believe the answer is:
token
'voucher' is the definition.
(I've seen this before)
'to fellow' is the wordplay.
'fellow' becomes 'ken' (I can't justify this - if you can you should give a lot more credence to this answer).
'to'+'ken'='TOKEN'
'given' acts as a link.
Can you help me to learn more?
(Other definitions for token that I've seen before include "Symbolic; voucher" , "signal" , "Emblem" , "Badge; voucher" , "Indication, symbol or voucher" .)