Cryptic crossword clue
Larking about in underground activity? Nothing right in that 9

The most common and most likely answer to this crossword clue is the 9 letter word CAVORTING

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "Larking about" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case larking about = cavorting.
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.

Crossword Answer definitions

CAVORTING verb
  1. (originally intransitive) To prance, said of mounts
  2. To move about carelessly, playfully or boisterously.
CAVORTING noun
  1. The action of the verb to cavort

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