The most common and most likely answer to this crossword clue is the 13 letter word POTTY-TRAINED
I've seen this crossword clue in Financial Times
P
O
T
T
Y
-
T
R
A
I
N
E
D
More clues leading to the result POTTY-TRAINED
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does POTTY-TRAINED mean?
POTTY-TRAINED adjective- Synonym of toilet-trained