The most common and most likely answer to this crossword clue is the 7 letter word ARRANGE
I've seen this crossword clue in Financial Times
A
R
R
A
N
G
E
More clues leading to the result ARRANGE
- Set out with a compass crossing river
- Called in a body of engineers to fix
- Fix up say to go beyond Scottish island
- Organise a run over some mountains
- . Organise a series of summits around October’s end
- Initially, Ronald Reagan represented order
- Set out from Scottish island, say, going west
- Score runs in a series
- Discarding wingers, Harry Kane’s ultimately preferring mid-field position
- Head for Rocky Mountains, after a fix
Buddy explains!

The straight part
We know that "fix" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fix = arrange.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 ARRANGE mean?
ARRANGE verb- To set up; to organize; to put into an orderly sequence or arrangement.
- To plan; to prepare in advance.
- To prepare and adapt an already-written composition for presentation in other than its original form.