The most common and most likely answer to this crossword clue is the 11 letter word PRETENTIOUS
P
R
E
T
E
N
T
I
O
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S
Buddy explains!

The straight part
We know that "8" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 8 = pretentious.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 PRETENTIOUS mean?
PRETENTIOUS adjective- Intended to impress others; ostentatious.
- Marked by an unwarranted claim to importance or distinction.