The most common and most likely answer to this crossword clue is the 5 letter word SCUFF
I've seen this crossword clue in The Daily Telegraph
S
C
U
F
F
More clues leading to the result SCUFF
Buddy explains!

The straight part
We know that "Scratch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scratch = scuff.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 SCUFF mean?
SCUFF noun- (sometimes attributive) A mark left by scuffing or scraping.
- To scrape the feet while walking.
- To hit lightly, to brush against.
- To mishit (a shot on a ball) due to poor contact with the ball.
- A scurf; a scale.
- The back part of the neck; the scruff.