The most common and most likely answer to this crossword clue is the 10 letter word MISDIRECTS
I've seen this crossword clue in Financial Times
M
I
S
D
I
R
E
C
T
S
Buddy explains!

The straight part
We know that "Wrongly instructs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wrongly instructs = misdirects.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 MISDIRECTS mean?
MISDIRECTS verb- To direct something wrongly
- To direct attention away from covert actions or intended targets.
- To put the incorrect address on a mail item