He pursues another drink (6)
I believe the answer is:
chaser
'another drink' is the definition.
(I've seen this before)
'he pursues' is the wordplay.
I cannot really understand how this works, but
'he' could be 'chase' and 'chase' is located in the answer.
A single letter 'r' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chaser that I've seen before include "engraver" , "Drink following another of a different kind" , "Beer after spirits e.g." , "Milder drink taken after a stronger one" , "second drink" .)