Crossword Genius

Crazy toddler may sit on this (5)

Ross

I believe the answer is:

potty

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'crazy' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for potty that I've seen before include "Bonkers" , "sort of chamber?" , "Mad" , "Nuts" , "Where kids go" .)

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