Cryptic crossword clue
One playing Chopin not vocalizing 7

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

A
P
H
O
N
I
C

Buddy explains!

The straight part
We know that "not vocalizing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not vocalizing = aphonic.
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 APHONIC mean?

APHONIC adjective
  1. Of, relating to, or exhibiting aphonia; unable to speak.

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