The most common and most likely answer to this crossword clue is the 9 letter word ERRONEOUS
I've seen this crossword clue in The Sunday Telegraph
E
R
R
O
N
E
O
U
S
More clues leading to the result ERRONEOUS
- Bound over to accept old copy that's inaccurate
- Misguided neurosurgeon operating without gun
- Wrong, or sure one’s wrong
- One’s true or false? The latter
- Wrong, or sure one is wrong
- Wrong or right, third person’s invested in euros, oddly
- Mistaken individual stopping user or suspect
- Flawed sovereign, awfully sour one
- To slip up 1-0 against us is wrong
- Queen single in start nearly flawed
Buddy explains!

The straight part
We know that "Flawed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flawed = erroneous.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 ERRONEOUS mean?
ERRONEOUS adjective- Containing an error; inaccurate.
- Derived from an error.
- Mistaken.
- Wandering; erratic.
- Deviating from the requirements of the law, but without a lack of legal authority, thus not illegal.