The most common and most likely answer to this crossword clue is the 3 plus 2 letter word END UP
I've seen this crossword clue in The Guardian
E
N
D
U
P
More clues leading to the result END UP
- Parody lacking singular finish
- Finish piece of satire, ignoring introduction
- Turn out a satire that hasn’t succeeded
- Turn out to be point ahead
- Give a gaol sentence without revealing start or finish
- Finish in French in front of Irish politicians
- Finish burlesque topless
- Turn out to be the last to join in eastern party
- Eventually find oneself in satire that’s not succeeded
- Take off, heading away to finish
Buddy explains!

The straight part
We know that "Pan out" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pan out = end up.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.