The most common and most likely answer to this crossword clue is the 3 plus 2 letter word CUT UP
I've seen this crossword clue in The Daily Telegraph
C
U
T
U
P
More clues leading to the result CUT UP
- Clue to many unions being affected by separation
- Deeply distressed, snubbed at university
- Emotionally affected, having had an operation?
- Distressed copper’s taken up to station
- Upset dice
- Distressed union in a hole
- Dice moved a great deal
- Distraught trade union enters competition
- Guillotine out to slice through vessel, sliced into pieces
- Upset — and in pieces?
Buddy explains!

The straight part
We know that "Overtake dangerously/upset" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overtake dangerously/upset = cut up.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 CUT UP mean?
CUT UP noun- Someone who cuts up; someone who acts boisterously or clownishly, for example, by playing practical jokes.