What does the cryptic crossword clue "Officer knowledgeable about voucher (6)" mean?

The definition is "voucher". The wordplay uses a charade (building blocks). CO (synonym of "Officer") + UP (synonym of "knowledgeable") + ON (synonym of "about"); definition: "voucher" The answer is COUPON.

Officer knowledgeable about voucher (6)

Guardian Cryptic #27448 | 1 Down | 2018-03-05 flower

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