The most common and most likely answer to this crossword clue is the 10 letter word STATIONARY
I've seen this crossword clue in The Daily Telegraph
S
T
A
T
I
O
N
A
R
Y
More clues leading to the result STATIONARY
- Fixed position with upcoming young artist
- Still place soldiers next to a railway
- Still, try it on as a change!
- Fixed it as notary ordered
- Still a place to board a railway
- Not moving position by a railway
- I express gratitude? Not I, disrupted by start of action aboard Southern railway, immobile
- A railway needs to go east of somewhere like Paddington still
- Still writing stuff for the radio?
- What writer may be said to need still
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 = stationary.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 STATIONARY mean?
STATIONARY noun- One who, or that which, is stationary, such as a planet when apparently it has neither progressive nor retrograde motion.
- Not moving.
- Incapable of being moved
- Unchanging