Slightly crazy, dotty rhyme (5)

I believe the answer is:

potty

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'slightly crazy' is the definition.
'potty' can be an answer for 'crazy' (I've seen this before). I am not certain of the 'slightly' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for potty that I've seen before include "sort of chamber?" , "Trifling" , "Bonkers" , "Daft (informal)" , "Infant's loo" .)

I've seen this clue in the Evening Standard.

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