Latter edition about knowing how to go potty (6-7)
I believe the answer is:
toilet-trained
'knowing how to go potty' is the definition.
I can't judge whether this defines the answer.
'latter edition about' is the wordplay.
'about' indicates anagramming the letters.
'latter'+'edition'='latteredition'
'latteredition' is an anagram of 'TOILET-TRAINED'.
Can you help me to learn more?
(Other definitions for toilet-trained that I've seen before include "(Of small children) accustomed to the potty" , "No longer in need of nappies?" , "Able to use the loo" , "Latter edition (anag.)" .)