The most common and most likely answer to this crossword clue is the 5 letter word BLITZ
I've seen this crossword clue in Financial Times
B
L
I
T
Z
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 BLITZ mean?
BLITZ noun- A sudden attack, especially an air raid; usually with reference to the Blitz.
- A swift and overwhelming attack or effort.
- A play in which additional defenders beyond the defensive linemen rush the passer.
- Blitz chess, a form of chess with a short time limit for moves.
- To attack quickly or suddenly, as by an air raid or similar action.
- To perform a blitz.
- To purée or chop (food products) using a food processor or blender.
- To do something quickly or in one session.