Crossword Genius

He pursues another drink (6)

Ross

I believe the answer is:

chaser

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in The Mirror.
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