Cryptic crossword clue
Joke about secret number makes us open-mouthed 6

The most common and most likely answer to this crossword clue is the 6 letter word GAPING

I've seen this crossword clue in The Times
G
A
P
I
N
G

Buddy explains!

The straight part
We know that "open-mouthed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case open-mouthed = gaping.
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 GAPING mean?

GAPING verb
  1. To open the mouth wide, especially involuntarily, as in a yawn, anger, or surprise.
  2. To stare in wonder.
  3. To open wide; to display a gap.
  4. Of a cat: to open the passage to the vomeronasal organ, analogous to the flehming in other animals.
GAPING adjective
  1. Wide open.
GAPING noun
  1. The act of one who gapes.
  2. Something gaping; something agape.

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