The most common and most likely answer to this crossword clue is the 10 letter word SIMPLICITY
I've seen this crossword clue in The Guardian
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More clues leading to the result SIMPLICITY
Buddy explains!

The straight part
We know that "no difficulty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case no difficulty = simplicity.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 SIMPLICITY mean?
SIMPLICITY noun- The state or quality of being simple
- An act or instance of foolishness.