The most common and most likely answer to this crossword clue is the 5 letter word SLAMS
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Buddy explains!
The straight part
We know that "we’re harshly critical" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case we’re harshly critical = slams.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 SLAMS mean?
SLAMS verb- To shut with sudden force so as to produce a shock and noise.
- To put in or on a particular place with force and loud noise. (Often followed by a preposition such as down, against or into.)
- To strike forcefully with some implement.
- To strike against suddenly and heavily.
- To speak badly of; to criticize forcefully.
- To dunk forcefully, to slam dunk.
- To make a slam bid.
- To defeat (opponents at cards) by winning all the tricks of a deal or a hand.
- To change providers (e.g. of domain registration or telephone carrier) for a customer without clear (if any) consent.
- To drink off, to drink quickly.
- To compete in a poetry slam.
- To inject intravenously; shoot up.
- To defeat by winning all the tricks of a deal or a hand.