Crossword Genius

With which to catch a perch (3)

Ross

I believe the answer is:

rod

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'perch' is the definition.
(I know that perch can be written as rod)

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 "that most anglers use" , "Baton, pole" , "Sceptre" , "- - , pole or perch" , "Stick; angler" .)

I've seen this clue in the Evening Standard.
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