Sent back some discoloured ice in drink (5)
I believe the answer is:
cider
'drink' is the definition.
(alcoholic drink)
'sent back some discoloured ice' is the wordplay.
'sent back' says the letters should be written backwards.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'redic' can be found hidden inside 'discoloured ice'.
'redic' written backwards gives 'CIDER'.
'in' is the link.
(Other definitions for cider that I've seen before include "Alcoholic drink (to be taken with Rosie?)" , "Scrumpy" , "Drink made from pears" , "Alcoholic drink from fermented apple juice" , "Apple-based drink" .)