The most common and most likely answer to this crossword clue is the 7 letter word TRIVIUM
I've seen this crossword clue in The Guardian
T
R
I
V
I
U
M
Buddy explains!
The straight part
We know that "old liberal arts curriculum" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old liberal arts curriculum = trivium.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 TRIVIUM mean?
TRIVIUM noun- (in medieval universities) The lower division of the liberal arts; grammar, logic and rhetoric.
- The three anterior ambulacra of echinoderms, collectively.