Cryptic crossword clue
System of bookkeeping as old as the Ark? 6,5

The most common and most likely answer to this crossword clue is the 6 plus 5 letter word DOUBLE ENTRY

I've seen this crossword clue in The Daily Telegraph
D
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does DOUBLE ENTRY mean?

DOUBLE ENTRY adjective
  1. Describing a method of bookkeeping in which each transaction is entered in two accounts, for debits and for credits.

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