Drink, cold, can go the wrong way (6)
I believe the answer is:
cognac
'drink' is the definition.
(Cognac is an example)
'cold can go the wrong way' is the wordplay.
'cold' becomes 'c' (eg on taps).
'the wrong way' says the letters should be written backwards.
'can'+'go'='cango'
'cango' reversed gives 'ognac'.
'c'+'ognac'='COGNAC'
(Other definitions for cognac that I've seen before include "Brandy of the French Charente" , "strong drink" , "Type of brandy" , "warmer" , "High quality brandy" .)