The most common and most likely answer to this crossword clue is the 10 letter word TRANSVERSE
I've seen this crossword clue in The Daily Telegraph
T
R
A
N
S
V
E
R
S
E
More clues leading to the result TRANSVERSE
- Managed to penetrate works by Eliot, initially cross
- New stars never cross
- Cross pass through crossing both poles
- Oblique poetry on coaches one’s forgotten
- Performed save oddly in sharp cross
- Headed over save, oddly, in short cross
- Spoilt star with nerves getting cross
- Cross lines after locomotive’s dropped one off
- Cross including two poles placed crosswise!
- Cross stars never get sacked
Buddy explains!

The straight part
We know that "cross" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cross = transverse.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 TRANSVERSE mean?
TRANSVERSE noun- Anything that is transverse or athwart.
- The longer, or transverse, axis of an ellipse.
- To overturn; to change.
- To change from prose into verse, or from verse into prose.
- Situated or lying across; side to side, relative to some defined "forward" direction; identified with movement across areas.
- (of an intersection) Not tangent: so that a nondegenerate angle is formed between the two things intersecting.