Swig punch (4)

I believe the answer is:

slug

I believe this is a double definition.

'swig' is the first definition.
('slug' can be a synonym of 'swig')

'punch' is the second definition.
(thesaurus)

(Other definitions for slug that I've seen before include "Terrestrial mollusc" , "Garden pest - pellet" , "Some whisky perhaps" , "Slimy gastropod" , "Projectile fired from a gun" .)

I've seen this clue in The Times.

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