Cold duck, twice, followed by a hot drink (5)
I believe the answer is:
cocoa
'hot drink' is the definition.
(cocoa is a type of hot drink)
'cold duck twice followed by a' is the wordplay.
'cold' becomes 'c' (eg on taps).
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'twice' shows that letters should be duplicated.
'followed by' is a charade indicator (letters next to each other).
'c'+'o'='co'
'co' doubled is 'coco'.
'coco'+'a'='COCOA'
(Other definitions for cocoa that I've seen before include "Popular chocolate drink" , "Chocolate ingredient" , "Powder from cacao beans" , "Late-night drink" , "Kind of chocolate drink" .)