The most common and most likely answer to this crossword clue is the 9 letter word BREASTFED
I've seen this crossword clue in The Guardian
B
R
E
A
S
T
F
E
D
More clues leading to the result BREASTFED
Buddy explains!
The straight part
We know that "Drinking straight from jugs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drinking straight from jugs = breastfed.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BREASTFED mean?
BREASTFED verb- To feed (a baby) milk via the breasts; to suckle; to nurse.
- (chiefly of a baby) To nurse, to suck milk from a breast.