Cryptic crossword clue
I close form naughtily engaged in pranks 10

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

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "engaged in pranks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case engaged in pranks = frolicsome.
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

FROLICSOME adjective
  1. Characterised or marked by frolicking; playful.

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