The most common and most likely answer to this crossword clue is the 3 plus 2 plus 5 plus 5 letter word SIT ON ONE’S HANDS
I've seen this crossword clue in Financial Times
S
I
T
O
N
O
N
E
â
€
™
S
H
A
N
D
S
Buddy explains!
The straight part
We know that "to do nothing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to do nothing = sit on one’s hands.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.