Crossword Genius

Large mouthful of punch (4)

Ross

I believe the answer is:

slug

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'punch' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for slug that I've seen before include "Wallop" , "Slimy gastropod" , "ammunition?" , "Slimy fellow in bed" , "Projectile fired from a gun" .)

I've seen this clue in The Independent.
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