The most common and most likely answer to this crossword clue is the 5 plus 4 letter word HONEY TRAP
I've seen this crossword clue in Financial Times
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Buddy explains!
The straight part
We know that "seductive scheme" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case seductive scheme = honey trap.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 HONEY TRAP mean?
HONEY TRAP noun- The use of a romantic and/or sexual relationship to entice a person into revealing secret information.