Boy to go fishing with? (3)

I believe the answer is:

rod

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'boy' is the definition.
(I have seen 'Little boy' mean 'rod' so perhaps 'boy' could also mean '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 "- - , pole or perch" , "Thin straight bar" , "Rigid stick" , "Fishing implement" , "Stick, symbol of punishment" .)

I've seen this clue in the Evening Standard.

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