Veronica's son was good on the potty? (9)
I believe the answer is:
speedwell
'veronica's' is the definition.
(speedwell can mean a veronica plant)
'son was good on the potty?' is the wordplay.
I cannot quite understand how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found within the answer.
'good' could be 'well' (similar in meaning) and 'well' is located in the answer.
The remaining letters 'peed' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for speedwell that I've seen before include "Small blue flower of the genus veronica" , "Small creeping herbaceous plant with blue or pink flowers" , "Flowering plant" , "bloomer?" , "Small plant, veronica" .)