The most common and most likely answer to this crossword clue is the 4 letter word RASH
I've seen this crossword clue in The Times
R
A
S
H
More clues leading to the result RASH
- Product of volcano after right eruption
- Precipitate of arsenic introduced to rhodium
- Lacking caution in endeavour – a shame
- One might be spotted heading away from accident
- Possibly spots daredevil
- Rook in front of tree is not considered
- Reckless forward, first to be dismissed
- Impetuous when embraced by Royal Highness
- Skin condition not considered
- These spots not considered
Buddy explains!

The straight part
We know that "eruption" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eruption = rash.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 RASH mean?
RASH adjective- Acting too quickly without considering the risks and consequences; not careful; hasty.
- So dry as to fall out of the ear with handling, as corn.
- Requiring sudden action; pressing; urgent.
- Fast-acting.
- An area of reddened, irritated, and inflamed skin.
- A surge in problems; a spate, string or trend.
- To prepare with haste.
- An inferior kind of silk, or mixture of silk and worsted.
- To pull off or pluck violently.
- To slash; to hack; to slice.