Business repeated a milk drink (5)
I believe the answer is:
cocoa
'milk drink' is the definition.
'cocoa' can be an answer for 'drink' (cocoa is a kind of drink). I am unsure of the 'milk' bit.
'business repeated a' is the wordplay.
'business' becomes 'co' (short for company).
'repeated' shows that letters should be duplicated.
'co' duplicated is 'coco'.
'coco'+'a'='COCOA'
Can you help me to learn more?
(Other definitions for cocoa that I've seen before include "Chocolate powder" , "Warming bedtime drink" , "Main constituent of chocolate" , "Drinking chocolate" , "Bean used in making chocolate" .)