Ordered ninth? AM of regret! (3,7,5)
I believe the answer is:
the morning after
'ordered ninth? am of regret' is the definition.
I know nothing about this answer so I can't judge whether this works.
'ordered ninth? am of regret' is the wordplay.
'ordered' indicates anagramming the letters.
'ninth'+'am'+'of'+'regret'='ninthamofregret'
'ninthamofregret' is an anagram of 'THE MORNING AFTER'.
(Other definitions for the morning after that I've seen before include "Consequences of indulgence" , "unpleasant consequences" , "hangover" , "Unpleasant after-effects of an evening's drinking" .)