Pass on drinks with sweetheart faint (8)
I believe the answer is:
collapse
'faint' is the definition.
(thesaurus)
'pass on drinks with sweetheart' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'on' means one lot of letters go next to another.
'drinks' becomes 'laps' (lapping is a kind of drinking).
'with' says to put letters next to each other.
'sweetheart' becomes 'e' (the heart/centre of 'sweet').
'col'+'laps'+'e'='COLLAPSE'
(Other definitions for collapse that I've seen before include "Disintegration" , "downfall" , "Suddenly fall down or give way" , "Fall down as from weakness" , "Go to ruin" .)