The most common and most likely answer to this crossword clue is the 10 letter word UNFAITHFUL
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Buddy explains!
The straight part
We know that "Cheating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cheating = unfaithful.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 UNFAITHFUL mean?
UNFAITHFUL adjective- Not having religious faith.
- Not keeping good faith; disloyal; not faithful.
- Adulterous.
- Not honest or upright.
- Negligent or imperfect.
- Not faithfully rendering the meaning of the source language; incorrect.