Crossword Genius

Does give a rap when one’s uncomplimentary about! (6)

Ross

I believe the answer is:

knocks

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'does give' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their -s form.
Maybe you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for knocks that I've seen before include "Raps; criticises" , "Raps on the door" , "Bangs on door" , "Raps, taps" , "criticisms" .)

I've seen this clue in the Evening Standard.
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