The most common and most likely answer to this crossword clue is the 9 letter word SEDUCTION
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result SEDUCTION
Buddy explains!

The straight part
We know that "temptation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case temptation = seduction.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 SEDUCTION mean?
SEDUCTION noun- The act of seducing.
- (in English common law) The felony of, as a man, inducing a previously chaste unmarried female to engage in sexual intercourse on a promise of marriage.