The most common and most likely answer to this crossword clue is the 10 letter word STUDIOUSLY
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result STUDIOUSLY
- Boss, cunning, securing promissory note with due diligence
- Boss adheres to financial promise — shrewd in an academic way
- Boss I love leads university, crafty in a bookish way
- You and I entering list you’d rearranged deliberately
- Poor soul consumed by duty is working diligently
- Workplace American laboratory cleared out methodically
Buddy explains!
The straight part
We know that "with due diligence" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with due diligence = studiously.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 STUDIOUSLY mean?
STUDIOUSLY adverb- In a studious manner.