Drink contents of jug instead of a shot potentially from this (5)

I believe the answer is:

luger

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'a shot potentially from this' is the definition.
(Luger is a type of pistol)

'drink contents of jug instead' is the wordplay.
'drink' becomes 'glug' (I've seen this before).
'contents of' says to take the centre (I've seen 'content' mean this).
'jug instead' becomes 'ger' (I am not sure about this - if you are sure you should believe this answer much more).
The centre of 'glug' is 'lu'.
'lu'+'ger'='LUGER'

'of' is the link.

Can you help me to learn more?

(Other definitions for luger that I've seen before include "She goes down rapidly" , "Make of pistol" , "Shooter" , "Weapon" , "Type of (German) automatic pistol" .)

I've seen this clue in The Guardian.

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