One drink after another (6)
I believe the answer is:
chaser
'one drink after another' is the definition.
(I've seen this before)
'drink after another' is the wordplay.
'drink' becomes 'cha' (cha can mean tea).
'after' says to put letters next to each other.
'another' becomes 'ser' (I can't explain this - if you can you should give a lot more credence to this answer).
'cha'+'ser'='CHASER'
Can you help me to learn more?
(Other definitions for chaser that I've seen before include "Drink following one of another sort" , "Follow-up drink" , "One hunting" , "Drink that follows immediately after another one" , "Racehorse - search (anag)" .)