The most common and most likely answer to this crossword clue is the 8 letter word ORGANIST
I've seen this crossword clue in The Guardian
O
R
G
A
N
I
S
T
More clues leading to the result ORGANIST
- Trio sang after arranging for keyboard player
- One pulls out the stops roasting nuts
- Key worker possibly having to pedal
- Manual worker given dreadful roasting
- Musician gets an awful roasting
- One pulling out the stops in church?
- Player given an awful roasting
- Musician sang trio with ornamentation
- Musician given awful roasting
- Musician producing something alive almost, concert’s last piece
Buddy explains!

The straight part
We know that "Musician" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case musician = organist.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 ORGANIST mean?
ORGANIST noun- A musician who plays the organ.