The most common and most likely answer to this crossword clue is the 8 letter word ALL-TIME
I've seen this crossword clue in The Guardian
A
L
L
-
T
I
M
E
More clues leading to the result ALL-TIME
Buddy explains!

The straight part
We know that "such a record" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case such a record = all-time.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 ALL-TIME mean?
ALL-TIME adjective- Of all time; unsurpassed up to the present time.