The most common and most likely answer to this crossword clue is the 5 letter word STILE
I've seen this crossword clue in The Daily Telegraph
S
T
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More clues leading to the result STILE
Buddy explains!

The straight part
We know that "Climbing frame — for ramblers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case climbing frame — for ramblers = stile.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 STILE mean?
STILE noun- A set of one or more steps surmounting a fence or wall, or a narrow gate or contrived passage through a fence or wall, which in either case allows people but not livestock to pass.
- A vertical component of a frame or panel, such as that of a door, window, or ladder.
- Senses relating to a thin, pointed object.
- (by extension from sense 1.1) A particular manner of expression in writing or speech, especially one regarded as good.
- A particular manner of creating, doing, or presenting something, especially a work of architecture or art.
- To design, fashion, make, or arrange in a certain way or form (style)
- To call or give a name or title to.
- To create for, or give to, someone a style, fashion, or image, particularly one which is regarded as attractive, tasteful, or trendy.
- To act in a way which seeks to show that one possesses style.