Crossword Genius

A punitive measure (3)

Ross

I believe the answer is:

rod

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'measure' is the definition.
(rod is a kind of measure)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for rod that I've seen before include "Cane - shaft" , "Stick; angler" , "Little boy" , "Sceptre" , "Former measure equal to a quarter of a chain" .)

I've seen this clue in The Irish News.
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