The most common and most likely answer to this crossword clue is the 5 letter word D-DAY
D
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D
A
Y
More clues leading to the result D-DAY
Buddy explains!

The straight part
We know that "T'time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case t'time = d-day.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.