The most common and most likely answer to this crossword clue is the 13 letter word AMPLIFICATION
A
M
P
L
I
F
I
C
A
T
I
O
N
Buddy explains!
The straight part
We know that "sound boost" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sound boost = amplification.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 AMPLIFICATION mean?
AMPLIFICATION noun- The act, or result of amplifying, enlarging, extending or adding.
- The act, or result of independently increasing some quantity, especially voltage, power or current.
- Gain.
- The using of the polymerase chain reaction (PCR) for isolating and exponentially amplifying a fragment or sequence of DNA.
- A procedure used in the nomenclature of complex organic compounds in which the superatoms of a basic structure (a phane) are replaced by cyclic structures (amplificants).
- A translation technique that involves adding content that is not present in the source text to the target text, usually to improve the fluency of the translation.