The most common and most likely answer to this crossword clue is the 11 letter word EDUCATIONAL
I've seen this crossword clue in Financial Times
E
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Buddy explains!

The straight part
We know that "Academic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case academic = educational.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 EDUCATIONAL mean?
EDUCATIONAL noun- A free (or low cost) trip for travel consultants, provided by a travel operator or airline as a means of promoting their service. A fam trip
- Of, or relating to education.
- Instructive, or helping to educate.