The most common and most likely answer to this crossword clue is the 7 letter word RESCALE
I've seen this crossword clue in Independent
R
E
S
C
A
L
E
Buddy explains!
The straight part
We know that "Climb up again/to adjust compass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case climb up again/to adjust compass = rescale.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 RESCALE mean?
RESCALE verb- To alter the scale of a drawing or project; to change the physical proportions.
- To change the scope of a business or project to meet a change in demands.
- To scale again