The most common and most likely answer to this crossword clue is the 5 letter word POSER
I've seen this crossword clue in The Daily Telegraph
P
O
S
E
R
More clues leading to the result POSER
Buddy explains!

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 POSER mean?
POSER noun- A particularly difficult question or puzzle.
- Someone who asks a question or sets a problem.
- Someone who, or something which, poses; a person who sets their body in a fixed position, such as for photography or painting.
- A poseur; someone who affects some behaviour, style, attitude or other condition, often to impress or influence others.