The most common and most likely answer to this crossword clue is the 9 letter word SYNTHETIC
I've seen this crossword clue in The Guardian
S
Y
N
T
H
E
T
I
C
More clues leading to the result SYNTHETIC
- Town's upset about new article that's manufactured
- Mock speaker’s error? The jerk!
- Fake chest, tiny bum
- Fake jewellery’s ending in battered tin chest
- Article on “name” in financial centre’s rejected as inauthentic
- Tiny chest, bust, is fake
- Fake jewellery's ending in battered tin chest
- Mock speaker's error? The jerk!
- [Extremely stormy night here: movement’s not natural]
- Fake copy finally found in battered tin chest
Buddy explains!

The straight part
We know that "Fake" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fake = synthetic.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 SYNTHETIC mean?
SYNTHETIC noun- A synthetic compound.
- Of, or relating to synthesis.
- Produced by synthesis instead of being isolated from a natural source (but may be identical to a product so obtained).
- Artificial, not genuine,
- (grammar) Pertaining to the joining of bound morphemes in a word (compare analytic).
- Of a language, having a grammar principally dependent on the use of bound morphemes to indicate syntactic relationships (compare analytic).