The most common and most likely answer to this crossword clue is the 7 letter word ASTRIDE
I've seen this crossword clue in The Times
A
S
T
R
I
D
E
More clues leading to the result ASTRIDE
- A long pace with one leg each side
- Tirades knocked the way cyclists proceed
- Positioned across street is what interrupts a journey
- Norwegian girl last in queue stretching across
- A way to travel on horseback
- A way to go on 22 across?
- With a leg either side, sit and read novel
- Mounting satire attacked when Dominic sticks his nose in
- On the back of awful tirades
- A way to travel up
Buddy explains!

The straight part
We know that "with one leg each side" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with one leg each side = astride.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 ASTRIDE mean?
ASTRIDE adverb- With one’s legs on either side.
- With one’s legs on either side of.