The most common and most likely answer to this crossword clue is the 10 letter word SCARIFYING
I've seen this crossword clue in The Times
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Buddy explains!
The straight part
We know that "Harshly criticising" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case harshly criticising = scarifying.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 SCARIFYING mean?
SCARIFYING verb- To remove thatch (build-up of organic matter on the soil) from a lawn, to dethatch.
- To make scratches or cuts on.
- To harrow the feelings.
- To scar.
- Denude, or lay waste to.