Criminal after fine, one almost in jug (6)
I believe the answer is:
flagon
'jug' is the definition.
(I have seen 'Large jug ' mean 'flagon' so perhaps 'jug' could also mean 'flagon')
'criminal after fine one almost' is the wordplay.
'criminal' becomes 'lag' (I've seen this in other clues**).
'after' says to put letters next to each other.
'fine' becomes 'f' (abbreviation).
'almost' means to remove the last letter (most of the word but not all of it).
'one' with its last letter removed is 'on'.
'lag' put after 'f' is 'flag'.
'flag'+'on'='FLAGON'
'in' acts as a link.
(Other definitions for flagon that I've seen before include "Large vessel with a handle and spout" , "Large container for serving drink" , "Large rounded bottle for cider or wine" , "Snow White companion" , "Large wine vessel" .)