The most common and most likely answer to this crossword clue is the 8 letter word BACKFIRE
I've seen this crossword clue in The Sunday Telegraph
B
A
C
K
F
I
R
E
Buddy explains!
The straight part
We know that "Boomerang" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case boomerang = backfire.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 BACKFIRE mean?
BACKFIRE noun- A small, controlled fire set in the path of a larger uncontrolled fire, in order to limit the spread of the large fire by removing its fuel.
- An explosion produced either by a running internal combustion engine that occurs in the air intake or exhaust system rather than inside the combustion chamber or unburned fuel or hydrocarbons ignited somewhere in the exhaust system.
- A premature explosion in the cylinder of a gas or oil engine during the exhaust or the compression stroke, tending to drive the piston in the wrong direction.
- An explosion in the exhaust passages of an internal combustion engine.
- (of a gun, cannon, Bunsen burner, etc.) To fire in the opposite direction, for example due to an obstruction in the barrel.
- (of an engine) To experience a premature ignition of fuel or an ignition of exhaust gases, making a popping sound.
- To fail in a manner that brings down further misfortune.