Drink cold water before date, excitedly (4,3)
I believe the answer is:
iced tea
'drink' is the definition.
(iced tea is a kind of drink)
'cold water before date excitedly' is the wordplay.
'cold water' becomes 'ice'.
'before' is a charade indicator (letters next to each other).
'excitedly' indicates anagramming the letters (letters excited or stimulated into a new form).
'date' is an anagram of 'dtea'.
'ice'+'dtea'='ICED TEA'
(Other definitions for iced tea that I've seen before include "Chilled drink" , "Cold summer drink" , "Cool drink" .)