Charlie can go back for brandy (6)
I believe the answer is:
cognac
'brandy' is the definition.
(Cognac is an example)
'charlie can go back' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'back' says the letters should be written in reverse.
'can'+'go'='cango'
'cango' reversed gives 'ognac'.
'c'+'ognac'='COGNAC'
'for' is the link.
(Other definitions for cognac that I've seen before include "Liquor" , "High-quality brandy" , "High quality brandy" , "French brandy region" , "warmer" .)