The most common and most likely answer to this crossword clue is the 6 letter word AMBLER
I've seen this crossword clue in The Daily Telegraph
A
M
B
L
E
R
More clues leading to the result AMBLER
- Walker is fitter, covering miles
- One walker or another wiping brow?
- Leisurely pedestrian’s warning about lake
- Thriller writer, slow mover
- Walk beginning to end for one toddling along
- Better to lose first slow walker
- Rose, head dropping is one moving slowly
- Better getting rid of leader who proceeds slowly?
- Climber short of summit is one having a stroll
- One walking, one talking without end
Buddy explains!
The straight part
We know that "one moving at a slow pace" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one moving at a slow pace = ambler.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.