The most common and most likely answer to this crossword clue is the 6 letter word INSTAL
I've seen this crossword clue in The Sunday Telegraph
I
N
S
T
A
L
More clues leading to the result INSTAL
- Points in short typeface set up ready for use
- Place where horse is docked
- Connect Stalin with two disturbed characters
- Set up wartime leader in assuming new position
- Invest nearly everything at the end of the month
- Erection of some flats, ninety put in
- Isn’t having change of heart — a learner put in place
- Establish ruthless dictator, moving in first
- See 2d
- Set up — dictator got in, in front
Buddy explains!

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 INSTAL mean?
INSTAL verb- To pay by instalments.
- To connect, set up or prepare something for use.
- To admit formally into an office, rank or position.
- To establish or settle in.