The most common and most likely answer to this crossword clue is the 8 letter word PEROXIDE
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More clues leading to the result PEROXIDE
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The cryptic/wordplay part
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What does PEROXIDE mean?
PEROXIDE noun- A divalent radical or anion containing two oxygen atoms linked by a covalent bond; any substance containing this group which yields hydrogen peroxide when treated with an acid
- Hydrogen peroxide, especially an aqueous solution used as a bleach
- Any unstable compound or general formula R-O-O-R'
- To treat (something) with hydrogen peroxide, especially hair in order to bleach it