The most common and most likely answer to this crossword clue is the 8 letter word GYRATING
I've seen this crossword clue in The Daily Telegraph
G
Y
R
A
T
I
N
G
Buddy explains!

The straight part
We know that "spinning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spinning = gyrating.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 GYRATING mean?
GYRATING verb- To revolve round a central point; to move spirally about an axis, as a tornado; to revolve.