Cryptic crossword clue
Having demolished last of whisky, function all right? Nonsense 12

The most common and most likely answer to this crossword clue is the 12 letter word GOBBLEDYGOOK

I've seen this crossword clue in The Sunday Telegraph
G
O
B
B
L
E
D
Y
G
O
O
K


Buddy explains!

The straight part
We know that "Nonsense" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nonsense = gobbledygook.
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 GOBBLEDYGOOK mean?

GOBBLEDYGOOK noun
  1. Nonsense; meaningless or encrypted language.
  2. Something written in an overly complex, incoherent, or incomprehensible manner.

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