Cryptic crossword clue
Key expert's hint about wrong answer completely rejected 7

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

I've seen this crossword clue in The Times
P
I
A
N
I
S
T


Buddy explains!

The straight part
We know that "Key expert" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case key expert = pianist.
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 PIANIST mean?

PIANIST noun
  1. A person who plays the piano, particularly with skill or as part of an orchestra.
  2. (WWII) A spy using radio or wireless telegraphy to keep in touch with headquarters during the Second World War

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