The most common and most likely answer to this crossword clue is the 9 letter word ABRASIVES
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The straight part
We know that "Scratchy things" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scratchy things = abrasives.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 ABRASIVES mean?
ABRASIVES noun- A substance or material such as sandpaper, pumice, or emery, used for cleaning, smoothing, or polishing.
- Rock fragments, sand grains, mineral particles, used by water, wind, and ice to abrade a land surface.