Drink issue? That's coming later (10)
I believe the answer is:
downstream
'that's coming later' is the definition.
I can't judge whether this definition defines the answer.
'drink issue?' is the wordplay.
'drink' becomes 'down' (to down something can mean to drink it quickly).
'issue?' becomes 'stream' (I can't justify this - if you can you should give a lot more credence to this answer).
'down'+'stream'='DOWNSTREAM'
Can you help me to learn more?
(Other definitions for downstream that I've seen before include "Further along in the flow" , "direction?" , "With the current" .)