The most common and most likely answer to this crossword clue is the 6 letter word PADDED
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More clues leading to the result PADDED
Buddy explains!

The straight part
We know that "Walked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case walked = padded.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 PADDED mean?
PADDED verb- To stuff.
- To furnish with a pad or padding.
- To increase the size of, especially by adding undesirable filler.
- To imbue uniformly with a mordant.
- To deliberately play the ball with the leg pad instead of the bat.
- To travel along (a road, path etc.).
- To travel on foot.
- To wear a path by walking.
- To walk softly, quietly or steadily, especially without shoes.
- To practise highway robbery.
- Having padding.