Drunk after non-alcoholic drink? It's indisputable (10)
I believe the answer is:
watertight
'indisputable' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I don't see?
'drunk after non-alcoholic drink?' is the wordplay.
'drunk' becomes 'tight' (slang term).
'after' is a charade indicator (letters next to each other).
'non-alcoholic drink?' becomes 'water' (I've seen this before).
'tight' put after 'water' is 'WATERTIGHT'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for watertight that I've seen before include "Closely sealed" , "Impermeable - unbreakable" , "Proof against leaking" , "Without loopholes" , "seaworthy" .)