The most common and most likely answer to this crossword clue is the 9 plus 4 letter word CAMBRIDGE BLUE
I've seen this crossword clue in The Times
C
A
M
B
R
I
D
G
E
B
L
U
E
Buddy explains!
The straight part
We know that "East Anglian student involved in a row" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case east anglian student involved in a row = cambridge blue.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.