The most common and most likely answer to this crossword clue is the 8 letter word FLIMFLAM
F
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The straight part
We know that "deception" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case deception = flimflam.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 FLIMFLAM mean?
FLIMFLAM noun- Nonsense.
- Deception.
- To swindle or cheat.