The most common and most likely answer to this crossword clue is the 12 letter word ENTERTAINING
I've seen this crossword clue in The Daily Telegraph
E
N
T
E
R
T
A
I
N
I
N
G
More clues leading to the result ENTERTAINING
- Coming in holding that isn’t regularly amusing
- Amusing to go into children’s game, squeezing in twice
- Funny one in bronze, coming in bags
- Thinking about creating a diversion
- Again failing to start, with internet spoiling fun
- At home creating a diversion
- Hosting internet, gain trolls
- It’s providing fun — participate, incomes twice in game
- Changing gear, in tent, in fun
Buddy explains!

The straight part
We know that "At home/creating a diversion" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case at home/creating a diversion = entertaining.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 ENTERTAINING mean?
ENTERTAINING verb- To amuse (someone); to engage the attention of agreeably.
- To have someone over at one's home for a party or visit.
- To receive and take into consideration; to have a thought in mind.
- To take or keep in one's service; to maintain; to support; to harbour; to keep.
- To meet or encounter, as an enemy.
- To lead on; to bring along; to introduce.
- Entertainment.
- Very amusing; that entertains.