Cryptic crossword clue
Measure of acidity in a once lost instrument 7

The most common and most likely answer to this crossword clue is the 7 letter word ALPHORN

A
L
P
H
O
R
N

Buddy explains!

The straight part
We know that "instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instrument = alphorn.
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 ALPHORN mean?

ALPHORN noun
  1. A long, curved, wooden horn used by mountain-dwelling herders in the Alps, originally to call cattle but now only as musical instrument in classical and folk tunes.

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