Punishes for breaking a spare part (4)

I believe the answer is:

raps

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'punishes' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for raps that I've seen before include "Sprechgesang pop hits" , "Knocks sharply" , "Cracks" , "'Knocks, on the door say (4)'" .)

I've seen this clue in the Evening Standard.

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