Crossword Genius

Unfavourable criticism is always a blow (5)

Ross

I believe the answer is:

knock

I'm a little stuck... Click here to teach me more about this clue!

'a blow' is the definition.
(knock is a kind of blow)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for knock that I've seen before include "Tap on door" , "Bash" , "Fail to hit" , "Bang" , "Unfairly criticise" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.