The most common and most likely answer to this crossword clue is the 8 letter word SHAMMING
I've seen this crossword clue in The Daily Telegraph
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Buddy explains!
The straight part
We know that "making false pretences" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case making false pretences = shamming.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 SHAMMING mean?
SHAMMING verb- To deceive, cheat, lie.
- To obtrude by fraud or imposition.
- To assume the manner and character of; to imitate; to ape; to feign.