Tip a quantity of liquid for short one in jug (3)
I believe the answer is:
lag
'jug' is the definition.
(synonyms)
'tip a quantity of liquid for short one' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'quantity' could be 'l' (l is a kind of quantity) and 'l' is found within the answer.
A single letter 'g' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for lag that I've seen before include "Fall behind with gal" , "Fall behind with a convict" , "trail" , "habitual criminal?" , "Fall behind on march" .)