The most common and most likely answer to this crossword clue is the 10 letter word MOTIONLESS
I've seen this crossword clue in The Daily Telegraph
M
O
T
I
O
N
L
E
S
S
More clues leading to the result MOTIONLESS
- At a standstill, having nothing to debate?
- Short of a proposal, still
- Still not proposing?
- Still dark, it’s blocked up
- Still having nothing to put forward at meeting?
- Still without a proposal?
- Noise mostly almost shattered still
- Still not ready to start debate?
- Still lacking action in Westminster?
- Still, that’s how a very brief debate is?
Buddy explains!

The straight part
We know that "still" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case still = motionless.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 MOTIONLESS mean?
MOTIONLESS adjective- At rest, stationary, immobile, not moving.