The most common and most likely answer to this crossword clue is the 6 plus 3 plus 2 plus 5 letter word YOU’VE GOT ME THERE
I've seen this crossword clue in Financial Times
Y
O
U
â
€
™
V
E
G
O
T
M
E
T
H
E
R
E
More clues leading to the result YOU’VE GOT ME THERE
- No idea why, but I’m at the scene
- I don’t know the answer that’s in vogue, yet theorem fashionable
- Comment to chauffeur on reaching destination? I don’t know what to say
- I don’t know what the passenger eventually said
- Solver 5 to emerge with the solution I don’t know?
- Job done, cabbie, but now I’m confused
Buddy explains!

The straight part
We know that "I don’t know" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i don’t know = you’ve got me there.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.