Cryptic crossword clue
I’m sort of upset about one’s instruction for player 10

The most common and most likely answer to this crossword clue is the 10 letter word FORTISSIMO

I've seen this crossword clue in The Daily Telegraph
F
O
R
T
I
S
S
I
M
O

Buddy explains!

The straight part
We know that "instruction for player" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instruction for player = fortissimo.
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 FORTISSIMO mean?

FORTISSIMO noun
  1. The dynamic sign indicating that the piece should be played fortissimo. Abbreviation: ff.
FORTISSIMO adverb
  1. Indicating that the piece is played very loud.

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