It's just drink after drink! (6)

I believe the answer is:

chaser

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'drink after drink' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for chaser that I've seen before include "Follow-up drink" , "different drink to follow" , "One hunting" , "Horse; drink following another" , "engraver" .)

I've seen this clue in the Evening Standard.

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