Crossword Genius

Get her informant drunk -- when will he pay for it? (3,7,5)

Ross

I believe the answer is:

the morning after

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'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" .)

I've seen this clue in The Telegraph.
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