The most common and most likely answer to this crossword clue is the 8 letter word PRATFALL
I've seen this crossword clue in Independent
P
R
A
T
F
A
L
L
More clues leading to the result PRATFALL
- Slip and cloak worn by rogue female
- Planned trip with publicity ace some time before autumn
- Embarrassing blunder by blackguard, fellow punching bore
- Embarrassing mistake by friend, describing bad fart by lecturer
- Short talk with everyone about fellow’s humiliating blunder
- Promoting a rickety flat above lake is embarrassing failure
- Veil worn by informer following humiliating blunder
Buddy explains!

The straight part
We know that "Planned trip" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case planned trip = pratfall.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 PRATFALL mean?
PRATFALL noun- A fall onto the buttocks.
- A humiliating mistake.
- A staged trip or fall, often for comedic purposes.
- To fall on to the buttocks.