The most common and most likely answer to this crossword clue is the 8 letter word GRAECISE
I've seen this crossword clue in The Guardian
G
R
A
E
C
I
S
E
Buddy explains!
The straight part
We know that "get fit to Olympic standards? /get fit to Olympic standards?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case get fit to olympic standards? /get fit to olympic standards? = graecise.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 GRAECISE mean?
GRAECISE verb- To render Grecian, or cause (a word or phrase in another language) to take a Greek form.
- To translate into Greek.
- To conform to the Greek custom, especially in speech.