Drink brought back is allowed to turn cold (6)
I believe the answer is:
cognac
'drink' is the definition.
(Cognac is an example)
'back is allowed to turn cold' is the wordplay.
'back' says the letters should be written in reverse.
'is allowed to' becomes 'can' (if you're allowed to do something, you can do it).
'turn' becomes 'go' (a person's move in a board game).
'cold' becomes 'C' (eg on taps).
'can'+'go'+'c'='cangoc'
'cangoc' written backwards gives 'COGNAC'.
'brought' is the link.
(Other definitions for cognac that I've seen before include "strong drink" , "(French district famed for) fine brandy" , "French town - French brandy" , "Type of brandy" , "Good brandy" .)