The most common and most likely answer to this crossword clue is the 5 letter word HIKER
I've seen this crossword clue in The Guardian
H
I
K
E
R
More clues leading to the result HIKER
- Who’s struck roadside, shifting feet?
- Somebody who rambles for an hour about US president
- One looking for a lift after hitch
- One grand received by female rambler
- Walker greeting bishop leaving the pavement edge
- Walker greeting king and queen
- One may take longer when one travels without a hitch
- Walker says hello to king and queen
- One rambling tramp at side of road
- One kilometre covered by that woman backpacker
Buddy explains!

The straight part
We know that "rambler" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rambler = hiker.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 HIKER mean?
HIKER noun- One who hikes, especially frequently.