The most common and most likely answer to this crossword clue is the 5 letter word OUTGO
O
U
T
G
O
Buddy explains!

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 OUTGO mean?
OUTGO noun- The act or process of going out.
- A quantity of a substance or thing that has flowed out; an outflow.
- An expenditure, cost or outlay.
- To go out, to set forth.
- To go further; to exceed or surpass; go beyond.
- To overtake; to travel faster than.
- To outdo; exceed; surpass.
- To come to an end.