The answer to the clue "book keeper for Dr Cockerel King got it wrong (6,5)" (11 letters) is "RECORD CLERK." Explanation:

• The clue involves wordplay and an anagram indicated by "got it wrong."
• Rearranging "DR COCKERL" plus K (for King) forms the phrase "RECORD CLERK."
• A record clerk is a type of bookkeeper who manages and maintains records, fitting the definition part of the clue.
• This solution matches the enumeration (6,5) and is a common clerical job title associated with bookkeeping and record keeping.