The most common and most likely answer to this crossword clue is the 4 plus 6 letter word ROPE LADDER
I've seen this crossword clue in The Daily Telegraph
R
O
P
E
L
A
D
D
E
R
Buddy explains!
The straight part
We know that "Going up the wall? Take this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case going up the wall? take this = rope ladder.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.