Crossword Genius

O compound (5)

Ross

I believe the answer is:

oxide

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">o compound</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that oxide is a type of chemical compound)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for oxide that I've seen before include "Eg, rust" , "Compound such as rust" , "Rust is iron -" , "Compound of two elements, one with atomic number 8" , "Rust, for instance" .)

I've seen this clue in The Guardian.
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