The most common and most likely answer to this crossword clue is the 8 letter word PARROTED
I've seen this crossword clue in The Sunday Telegraph
P
A
R
R
O
T
E
D
More clues leading to the result PARROTED
Buddy explains!

The straight part
We know that "mindlessly repeated" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mindlessly repeated = parroted.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 PARROTED mean?
PARROTED verb- To repeat (exactly what has just been said) without necessarily showing understanding, in the manner of a parrot.