Drivel from mouth after cold drink (8)
I believe the answer is:
claptrap
'drivel' is the definition.
(thesaurus)
'mouth after cold drink' is the wordplay.
'mouth' becomes 'trap' (informal term for mouth).
'after' is a charade indicator (letters next to each other).
'cold drink' becomes 'clap' (I've seen this in other clues).
'trap' after 'clap' is 'CLAPTRAP'.
'from' is the link.
(Other definitions for claptrap that I've seen before include "Absurd or nonsensical talk or ideas" , "Pretentious talk or nonsense" , "Cobblers" , "Foolish or pretentious talk" , "Meaningless nonsense" .)