Cryptic crossword clue
Ominously indicating bad news for postprandial drinkers? 10

The most common and most likely answer to this crossword clue is the 10 letter word PORTENDING

I've seen this crossword clue in The Sunday Telegraph
P
O
R
T
E
N
D
I
N
G

Buddy explains!

The straight part
We know that "Ominously indicating" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ominously indicating = portending.
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 PORTENDING mean?

PORTENDING verb
  1. To serve as a warning or omen of.
  2. To signify; to denote.

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