The most common and most likely answer to this crossword clue is the 8 letter word RUMBLING
I've seen this crossword clue in The Times
R
U
M
B
L
I
N
G
More clues leading to the result RUMBLING
Buddy explains!

The straight part
We know that "Fingering" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fingering = rumbling.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 RUMBLING mean?
RUMBLING verb- To make a low, heavy, continuous sound.
- To discover deceitful or underhanded behaviour.
- To move while making a rumbling noise.
- To fight; to brawl.
- (of a game controller) to provide haptic feedback by vibrating.
- To cause to pass through a rumble, or polishing machine.
- To murmur; to ripple.
- A muted sound of complaint or discontent.
- A deep low noise.
- Deep- and slow-sounding.