The most common and most likely answer to this crossword clue is the 7 letter word EXPLODE
E
X
P
L
O
D
E
More clues leading to the result EXPLODE
- Pop by place featured in English poem
- Former policeman with Ecstasy is let off
- Former policeman initially expected to get angry
- Go off and trudge into river
- Discharge policeman found in south-western river
- Go off and walk in river
- Go off in search having lost king for days
- Former officer with energy set off
- See red clump in SW river?
- See red when drug found on retired copper
Buddy explains!

The straight part
We know that "perish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case perish = explode.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 EXPLODE mean?
EXPLODE verb- To destroy with an explosion.
- To destroy violently or abruptly.
- To create an exploded view of.
- To disprove or debunk.
- To blast, to blow up, to burst, to detonate, to go off.
- To make a violent or emotional outburst.
- To increase suddenly.
- (PHP) To break (a delimited string of text) into several smaller strings by removing the separators.
- To decompress (data) that was previously imploded.
- To open all doors and hatches on an automobile.