The most common and most likely answer to this crossword clue is the 9 letter word INTRICATE
I've seen this crossword clue in The Guardian
I
N
T
R
I
C
A
T
E
More clues leading to the result INTRICATE
- Difficult to understand — certain it must be rewritten
- Fancy nice tart I cooked?
- Strangely certain it is complicated
- Fancy popular gallery having racist leader in charge!
- Complex article initially taken in in an instant
- Complex about being surrounded by popular and banal
- Fancy popular gallery keeping racist leader in charge!
- Involved in scam? Back out, along with mischievous Greek
- Reorganisation of it certain to be very complicated
- Complex in California, dull outside
Buddy explains!

The straight part
We know that "Fancy" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fancy = intricate.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 INTRICATE mean?
INTRICATE adjective- Having a great deal of fine detail or complexity.
- To become enmeshed or entangled.
- To enmesh or entangle: to cause to intricate.