The most common and most likely answer to this crossword clue is the 7 letter word TENURED
I've seen this crossword clue in The Daily Telegraph
T
E
N
U
R
E
D
More clues leading to the result TENURED
- Plastic denture kept for an agreed time
- Win over university leftist with employment for life?
- Having an office under the vacated complex
- Toughened after time with permanent post
- With time guaranteed, though last of students drops out?
- Number terribly rude unfortunately unable to be sacked?
- Get used to being in Treasury Department with a secure job
- Loose denture made secure, in a way
- New denture given permanent position
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 TENURED mean?
TENURED verb- To grant tenure, the status of having a permanent academic position, to (someone).
- Having tenure