The most common and most likely answer to this crossword clue is the 8 letter word ITERATED
I've seen this crossword clue in The Daily Telegraph
I
T
E
R
A
T
E
D
Buddy explains!

The straight part
We know that "Repeated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case repeated = iterated.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 ITERATED mean?
ITERATED verb- To perform or repeat an action on each item in a set
- To perform or repeat an action on the results of each such prior action
- To utter or do a second time or many times; to repeat.
- To repeat an activity, making incremental changes each time