The most common and most likely answer to this crossword clue is the 5 letter word GAMUT
I've seen this crossword clue in Financial Times
G
A
M
U
T
More clues leading to the result GAMUT
- Graduate aboard boat mounting compass
- Range offered by school and university over time
- First pair of marines aboard harbour vessel, back in range
- A foreign character picked up tee on golf range
- Upset stomach on a grand scale
- Old woman aboard boat returned compass
- Compass shows mother in boat going north
- Sweep in the morning, empty bags
- Range greater and more unusual than initially shown
- Boat carrying mother turned back when in range
Buddy explains!

The straight part
We know that "compass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case compass = gamut.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 GAMUT mean?
GAMUT noun- A (normally) complete range.
- All the notes in the musical scale.
- All the colours available to a device such as a monitor or printer.