Crossword Genius

Name your weapon (3)

Ross

I believe the answer is:

rod

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rod that I've seen before include "Flexible stick for 11 Down" , "Staff" , "Old saying 'Spare the . . . and spoil the child'" , "Angler's pole" , "Wand - fishing stick" .)

I've seen this clue in the Evening Standard.
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