The most common and most likely answer to this crossword clue is the 12 letter word MULLIGATAWNY
I've seen this crossword clue in The Times
M
U
L
L
I
G
A
T
A
W
N
Y
More clues leading to the result MULLIGATAWNY
- Liquid lunch? Ugly lawman tipsy with it
- At will, any mug can be prepared for soup
- Soup Ingmar regularly sampled in island port
- Turning bad in cup, a yellowish-brown soup
- Retiring sick, tucked into beaker with a brownish soup
- Consider American serving up a brown spicy dish
- Turning sickly in cup, a yellowish-brown soup
Buddy explains!

The straight part
We know that "Liquid lunch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case liquid lunch = mulligatawny.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 MULLIGATAWNY mean?
MULLIGATAWNY noun- An Indian soup having a meat base and curry seasoning.