The most common and most likely answer to this crossword clue is the 4 plus 5 plus 4 letter word WEEK AFTER WEEK
W
E
E
K
A
F
T
E
R
W
E
E
K
Buddy explains!
The straight part
We know that "Time and time again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case time and time again = week after week.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.