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

The straight part
We know that "Fancies" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fancies = illusions.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 ILLUSIONS mean?
ILLUSIONS noun- Anything that seems to be something that it is not.
- A misapprehension; a belief in something that is in fact not true.
- A magician’s trick.
- The state of being deceived or misled.