The most common and most likely answer to this crossword clue is the 6 letter word PERISH
I've seen this crossword clue in The Daily Telegraph
P
E
R
I
S
H
More clues leading to the result PERISH
- Express contempt over first couple of errors, and depart
- To die from contents of hamper is horrendous
- Pass away – for each is, primarily, human
- Pass by one with Sherlock Holmes initially
- Fairies, with the first sign of hunger, pass away
- Decay as a result of unusual rise in pH
- Depart for everyone’s high
- Fall, for every one’s hard
- Die like a Scandinavian man?
- Some hope Rishi’ll disappear
Buddy explains!

The straight part
We know that "pass away" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pass away = perish.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 PERISH mean?
PERISH verb- To decay and disappear; to waste away to nothing.
- To decay in such a way that it can't be used for its original purpose
- To die; to cease to live.
- To cause to perish.