To Kenneth, a voucher (5)

I believe the answer is:

token

'a voucher' is the definition.
(I've seen this before)

'to kenneth' is the wordplay.
'kenneth' becomes 'ken' (short for Kenneth).
'to'+'ken'='TOKEN'

(Other definitions for token that I've seen before include "Indication, symbol or voucher" , "Privately issued coin or voucher" , "Perfunctory" , "Symbol; metal disc" , "Something of sentimental value" .)

I've seen this clue in the Sydney Morning Herald.

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