The most common and most likely answer to this crossword clue is the 8 letter word RASHNESS
I've seen this crossword clue in Independent
R
A
S
H
N
E
S
S
More clues leading to the result RASHNESS
- Spots some Scottish Water precipitation
- Lack of care skin problem on head required
- Queen remains holding new sceptre initially – bold behaviour
- Lack of caution? Academy head should keep quiet!
- Eruption with head showing intemperance
- Run as hunter’s regularly beginning to show impetuosity
- News updates about remains, at half-nine, showing indiscretion
- Son interfering in dismantling harness shows audacity
- Precipitation — a drop of rain — remains on head
- Red spots on head showing lack of care
Buddy explains!
The straight part
We know that "bold behaviour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bold behaviour = rashness.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.