The most common and most likely answer to this crossword clue is the 4 plus 11 letter word FOUR DIMENSIONAL
I've seen this crossword clue in Financial Times
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Buddy explains!
The straight part
We know that "in time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in time = four dimensional.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 FOUR DIMENSIONAL mean?
FOUR DIMENSIONAL adjective- Having four dimensions; being measurable along four mutually perpendicular axes.
- Relating to the four dimensions of space-time (three spatial dimensions with the addition of time as the fourth)