Get her informant drunk -- when will he pay for it? (3,7,5)
I believe the answer is:
the morning after
'will he pay for it?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'get her informant drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'get'+'her'+'informant'='getherinformant'
'getherinformant' with letters rearranged gives 'THE MORNING AFTER'.
'when' is the link.
Can you help me to learn more?
(Other definitions for the morning after that I've seen before include "hangover" , "Unpleasant after-effects of an evening's drinking" , "Consequences of indulgence" , "unpleasant consequences" .)