The most common and most likely answer to this crossword clue is the 9 letter word CLOSETING
I've seen this crossword clue in The Times
C
L
O
S
E
T
I
N
G
Buddy explains!
The straight part
We know that "hiding away" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hiding away = closeting.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 CLOSETING mean?
CLOSETING verb- To shut away for private discussion.
- To put into a private place for a secret interview or interrogation.
- To shut up in, or as in, a closet for concealment or confinement.
- A private conference or interview.